Liquid crystal display device, backlight used for same display device, method for driving same backlight and method for manufacturing same backlight

ABSTRACT

A Liquid Crystal Display (LCD), a backlight used for the LCD and a method for producing the LCD and the backlight are provided which are capable of inhibiting an increase in component counts and in assembling processes and of reducing them, thereby achieving low costs. A display image is obtained by arranging a backlight section being able to perform scanning as a single unit in a manner that it positionally matches a liquid crystal displaying section. The backlight section is provided with a plurality of scanning electrodes and light emitting layers each providing a different luminescent color, and being spatially separated from each other on a principal face of the backlight and scanning is performed on a plurality of light emitting layers providing a different luminescent color.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a liquid crystal display device,a backlight used for a same display device, a method for driving a samebacklight and a method for manufacturing a same backlight.

[0003] The present application claims priorities of Japanese PatentApplication No. 2001-324873 filed on Oct. 23, 2001, which are herebyincorporated by reference.

[0004] 2. Description of the Related Art

[0005] In recent years, a remarkable improvement in performance of aliquid crystal display device (hereinafter being referred to an “LCD”)is yielded and also a remarkable progress in making its screen larger ismade. The LCD having a large screen is used as a monitor for a personalcomputer or a like. Development work of a liquid crystal television byexpanding technology of the LCD with a large screen is activelyproceeding.

[0006] In such an application to the television, an improvement inperformance of displaying a moving picture in an LCD is stronglyrequired. There are two main reasons for dissatisfactory performance ofa conventional LCD.

[0007] The first reason is that a response speed in the LCD is low. Thesecond reason is that display using the LCD is performed by usingilluminating light being applied constantly. Hereinafter, the secondreason is described in detail. In ordinary cases, in a CRT (Cathode RayTube) which performs display of moving pictures, a movie or a like, aperiod of non-display is provided between displaying time for a screenand for a subsequent screen.

[0008] In the CRT, an image screen is produced by scanning using anelectron beam on a fluorescent material. As a result, fluorescent lightfor a pixel disappears after being scanned and does not appear until asubsequent screen scanning period starts.

[0009] Moreover, in the case of a movie, due to a period required forfeeding a film existing between displaying time for a screen and asubsequent screen, illuminating light is intercepted, in ordinary cases,during this period.

[0010] On the other hand, in the case of the LCD, since light fed from abacklight is applied constantly, a non-display period between displayingtime for a screen and for a subsequent screen does not exist. Therefore,even if a moving picture is displayed using the LCD, the moving pictureslook like as if they shake.

[0011] To solve this problem, a method is proposed in which light to befed from the backlight is applied in synchronization with timing ofscanning on the liquid crystal display screen. This method is disclosedin a literature, for example, “First Response Liquid Crystal Display”(by Taira et al., AM-LCD 1998, p113-p116). In this case, the backlightis made up of an LED (Light Emitting Diode) and is lit insynchronization with timing of scanning on the LCD. This causes ascanning screen like a CRT to be produced in a pseudo manner, therebytrying to improve performance of displaying moving pictures.

[0012] For example, a backlight assembly to be used for an LCD having afluorescent layer disclosed in Patent Application Laid-open No. Hei9-258227 is provided with a plurality of cold cathode fluorescent tubeshaving a length being equivalent to a liquid crystal panel and beingstacked in layers in parallel and a pair of supporting plates adapted tosupport a fluorescent tube being coupled to an end of a cold cathodefluorescent tube, in which the fluorescent tube is sequentially lit toform a consecutive image on a screen and, in order to excite afluorescent material (phosphor) contained in a fluorescent layer, lighthaving a magenta color with a wavelength of 380 nm to 420 nm is emitted.

[0013] Moreover, Japanese Patent Application Laid-open No. Hei 10-10997discloses a method for driving a display device which places a pluralityof line-shaped light sources for emitting each of R, G, and B colors ona transparent light guiding plate made of an acrylic resin so that lighthaving each of the colors extends in a scanning line direction andhaving a backlight device with a width of the line-shaped light sourcesfor emitting each of the R, G, and B colors being equivalent to severaltens of horizontal pixel lines employed in the liquid crystal panel inwhich, when the horizontal pixel line of the display panel is selectedfor scanning, the line-shaped light source corresponding to the drivingline emits light having each of colors corresponding to its colorsignal.

[0014] These conventional backlight units adapted to apply light fedfrom the backlight in synchronization with timing of scanning on the LCDpresent problems in that component counts increase and a rise in costsfor fabrication are unavoidable. That is, when the LED is used, sincemany LEDs have to be arranged on a surface of the backlight, theincrease in component counts and in assembling processes areunavoidable. This presents a serious problem in the case of alarge-screen-type LCD in particular.

[0015] Moreover, even when a plurality of cold cathode fluorescent tubesis used, as a size of a screen increases, a number of the cold cathodefluorescent tubes increases. Therefore, a price of the backlight risesin the case of the large-screen-type LCD.

[0016] Thus, in the conventional scanning-type backlight, thoughperformance of displaying a moving picture is improved, costs forfabricating the backlight are high and therefore it is impossible tomake low a price of the LCD device.

SUMMARY OF THE INVENTION

[0017] In view of the above, it is an object of the present invention toprovide a liquid crystal display device, a backlight used for a samedisplay device, a method for driving a same backlight and a method formanufacturing a same backlight, each of which is capable of inhibitingan increase in component counts and assembling processes and of reducingthem, thereby obtaining the LCD and its backlight unit at low costs.

[0018] According to a first aspect of the present invention, there isprovided a liquid crystal display device including:

[0019] a liquid crystal display section;

[0020] a backlight section used to feed illuminating light to the liquidcrystal display section,

[0021] wherein the backlight section includes a backlight face, ascanning electrode portion of which is made up of a plurality ofscanning electrode groups each having a plurality of scanningelectrodes, a plurality of light emitting layer groups, each of which ismade up a plurality of light emitting layer each having a differentluminescent color, and being spatially separated from each other on thebacklight face; and

[0022] a scanning drive circuit to scan every the light emitting layergroup, as a scanning unit.

[0023] According to a second aspect of the present invention, there isprovided a liquid crystal display device including:

[0024] a liquid crystal display section;

[0025] a backlight section used to feed illuminating light to the liquidcrystal display section,

[0026] wherein the backlight section includes a backlight face, aplurality of scanning electrodes, a plurality of light emitting layerseach having a different luminescent color, and being spatially separatedfrom each other on the backlight face; and

[0027] a tone changing circuit to change light emitting time of each ofthe luminescent colors in a scanning direction in the backlight and thusto change a color tone in a region being scanned.

[0028] According to a third aspect of the present invention, there isprovided a liquid crystal display device including:

[0029] a liquid crystal display section;

[0030] a backlight section used to feed illuminating light to the liquidcrystal display section wherein a width of screen scanning in thebacklight section is larger than a width of screen scanning in theliquid crystal display section.

[0031] In the foregoing, a preferable mode is one wherein the width ofscreen scanning in the backlight section is an integral multiple of thewidth of screen scanning in the liquid crystal display section.

[0032] Also, a preferable mode is one that wherein includes a unit tohave a scanning phase in the backlight section lag behind a scanningphase in the liquid crystal displaying section.

[0033] According to a fourth aspect of the present invention, there isprovided a liquid crystal display device including:

[0034] a liquid crystal display section;

[0035] a backlight section used to feed illuminating light to the liquidcrystal display section wherein the backlight section has a plurality ofscanning electrodes; and

[0036] a unit to have a scanning phase in the backlight section lagbehind a scanning phase in the liquid crystal display section, whereinbacklight light is fed after a response by the liquid crystal displaysection.

[0037] In the foregoing, a preferable mode is one wherein, in the liquidcrystal display section, illuminating light for displaying is appliedfrom the backlight section to a pixel existing in a vicinity of aselected scanning line and illuminating light for displaying is notapplied from the backlight section to a pixel in a non-selected scanningline.

[0038] Also, a preferable mode is one wherein the liquid crystal displaysection is driven in a simple matrix manner.

[0039] Also, a preferable mode is one that wherein includes a unit tochange light emitting time in a region where light is being fed in ascanning direction in the backlight, thus to change maximum luminance oflight in the region being scanned.

[0040] Furthermore, a preferable mode is one that wherein is providedwith a light diffusing layer between the liquid crystal display sectionand the backlight section to diffuse light fed from the backlightsection in a plane direction inside the light diffusing layer.

[0041] According to a fifth aspect of the present invention, there isprovided a liquid crystal display device including:

[0042] a liquid crystal display section;

[0043] a backlight section used to feed illuminating light to the liquidcrystal display device; and

[0044] a prism layer made up of a single layer or a plurality of layersused to change light fed from the backlight section into light havingdirectivity, being mounted between the liquid crystal display sectionand the backlight section.

[0045] In the foregoing, a preferable mode is one that wherein thebacklight section, the prism layer, a light diffusing layer used todiffuse light fed through the prism layer from the backlight section ina plane direction inside the light diffusing layer and the liquidcrystal display section, which are stacked in layers in this order.

[0046] According to a sixth aspect of the present invention, there isprovided a liquid crystal display device including:

[0047] a liquid crystal display section;

[0048] a backlight section used to feed illuminating light to the liquidcrystal display section; and

[0049] an anti-EMI (Electro-Magnetic Interference) filter layer beingmounted between the liquid crystal display section and the backlightsection.

[0050] In the foregoing, a preferable mode is one wherein the anti-EMIfilter layer is mounted internally in the liquid crystal displayingsection.

[0051] According to a seventh aspect of the present invention, there isprovided a liquid crystal display device including:

[0052] a liquid crystal display section;

[0053] a backlight section used to feed illuminating light to the liquidcrystal display section; and

[0054] wherein the backlight section, an anti-EMI filter layer, a lightdiffusing layer used to diffuse light fed through the anti-EMI filterlayer from the backlight section in a plane direction inside the lightdiffusing layer and the liquid crystal display section, and the liquidcrystal display section are arranged in this order.

[0055] According to an eighth aspect of the present invention, there isprovided a liquid crystal display device including:

[0056] a liquid crystal display section;

[0057] a backlight section used to feed illuminating light to the liquidcrystal display section; and

[0058] either of an infrared ray absorbing layer to absorb infrared raysor an infrared ray reflecting filter layer to reflect infrared rays,both being mounted between the liquid crystal display section and thebacklight section.

[0059] According to a ninth aspect of the present invention, there isprovided a liquid crystal display device having four sides including:

[0060] a liquid crystal display section provided with a plurality ofscanning lines and a plurality of signal lines;

[0061] a backlight section used to feed illuminating light to the liquidcrystal display section and being provided with a plurality of scanningelectrodes;

[0062] wherein a side at which there is placed a terminal portion ofeach of the plurality of scanning lines and the plurality of the signallines in the liquid crystal display section are different from a side atwhich there placed a terminal portion of the plurality of the scanningelectrodes in the backlight section.

[0063] In the foregoing, a preferable mode is one wherein light fed fromthe backlight section is generated by discharge in a gas.

[0064] Also, a preferable mode is one wherein a gas is filled in thebacklight section in a hermetic manner and wherein light fed from thebacklight section is fluorescent light emitted from a fluorescentmaterial (phosphor) excited by excitation light generated by dischargein the gas.

[0065] Also, a preferable mode is one wherein a fluorescent layer ismounted on a front face of the liquid crystal display section andwherein light fed from the backlight section, after having passedthrough the liquid crystal display section, enters into the fluorescentlayer.

[0066] Also, a preferable mode is one wherein the backlight section ismaintained under vacuum and has a scanning electrode used to scan anelectron source and an electron fed from the electron source is guidedinto a fluorescent layer and wherein light fed from the backlightsection is produced by accelerating electrons under the vacuum andinjecting the accelerated electrons into the fluorescent layer.

[0067] Also, a preferable mode is one wherein the backlight section isprovided with an electroluminescent device and light fed from thebacklight section is electroluminescent light.

[0068] Also, a preferable mode is one wherein the backlight sectionincludes a plurality of light emitting layers each having a luminescentcolor, and being spatially separated from each other on a principal faceof the backlight, and in scanning of the backlight section, each of theluminescent colors is independently is scanned, and wherein timing ofscanning on a screen of the liquid crystal display section issynchronized with timing of scanning on a screen of the backlightsection.

[0069] Also, a preferable mode is one wherein the backlight sectionincludes a plurality of light emitting layer groups, each of which ismade up of a plurality of light emitting layers each having a differentluminescent color, and being spatially separated from each other on aprincipal face of the backlight, and in scanning of the backlightsection, each of the light emitting layer groups is scanned as ascanning unit, and wherein timing of scanning on a screen of the liquidcrystal display section is synchronized with timing of scanning on ascreen of the backlight section.

[0070] Also, a preferable mode is one wherein screen scanning in theliquid crystal display section and in the backlight section is performedin a same period.

[0071] Also, a preferable mode is one wherein a screen scanning periodin the liquid crystal display section is equal to a screen scanningperiod in the backlight section and wherein screen scanning in theliquid crystal display section is performed once during a period whenscreen scanning in the backlight section is performed two or more times.

[0072] According to a tenth aspect of the present invention, there isprovided a plane-type backlight including:

[0073] a first substrate and a second substrate being mounted apart fromeach other wherein gas is fed into space existing between the firstsubstrate and the second substrate and a portion surrounding the spaceis sealed in a hermetic manner;

[0074] a common electrode being mounted on the first substrate;

[0075] a plurality of scanning electrodes being mounted on the secondsubstrate; and

[0076] wherein a voltage is applied between the common electrode andeach of the scanning electrode to cause discharging to occur in thespace between the first substrate and the second substrate and whereinlight is emitted by exciting a fluorescent material being arrangedbetween the first substrate and the second substrate; and

[0077] wherein the common electrode is made up of electrodes formed soas to be at a same potential on an entire light emitting face.

[0078] According to an eleventh aspect of the present invention, thereis provided a plane-type backlight including:

[0079] a first substrate and a second substrate being mounted apart fromeach other wherein gas is fed into space existing between the firstsubstrate and the second substrate and a portion surrounding the spaceis sealed in a hermetic manner;

[0080] a common electrode being mounted on the first substrate;

[0081] a plurality of scanning electrodes being mounted on the secondsubstrate; and

[0082] wherein a voltage is applied between the common electrode andeach of the scanning electrode to cause discharging to occur in thespace existing between the first substrate and the second substrate andwherein light is emitted by exciting a fluorescent material beingarranged between the first substrate and the second substrate andwherein the common electrodes and the plurality of scanning electrodesare made up of a plurality of belt-shaped electrodes being extended in asame direction; and

[0083] a unit used to sequentially select one scanning electrode out ofthe plurality of scanning electrodes.

[0084] In the foregoing, a preferable mode is one wherein the commonelectrode and the plurality of the scanning electrode both being made upof the belt-shaped electrodes are configured to deviate positionallyfrom each other by a half period.

[0085] According to a twelfth aspect of the present invention, there isprovided a plane-type backlight including:

[0086] a first substrate and a second substrate being mounted apart fromeach other wherein gas is fed into space existing between the firstsubstrate and the second substrate and a portion surrounding the spaceis sealed in a hermetic manner;

[0087] a common electrode being mounted on the first substrate;

[0088] a plurality of scanning electrodes being mounted on the secondsubstrate;

[0089] wherein a voltage is applied between the common electrode andeach of the scanning electrode to cause discharging to occur in thespace existing between the first substrate and the second substrate andwherein light is emitted by exciting a fluorescent material beingarranged between the first substrate and the second substrate; and

[0090] a protrusion being protruded toward a side of discharging spaceexisting between electrodes facing each other on at least one of thecommon electrode and the plurality of the scanning electrode.

[0091] In the foregoing, a preferable mode is one wherein the protrusionis placed on a dielectric layer used to electrically insulate thedischarging space from the electrode.

[0092] Also, a preferable mode is one wherein the protrusion is placedon an electrode being exposed in the discharging space.

[0093] Also, a preferable mode is one wherein the common electrode andthe plurality of the scanning electrode are respectively made up of aplurality of belt-shaped electrodes being extended in a same directionand each of the belt-shaped electrodes corresponds to each luminescentcolor having one of RGB (red, green, and blue) colors.

[0094] Also, a preferable mode is one wherein the common electrode andthe scanning electrode are made up of belt-shaped electrodesintersecting at right angles to each other and each of the belt-shapedelectrodes corresponds to each luminescent color having one color out ofthe RGB colors.

[0095] According to a thirteenth aspect of the present invention, thereis provided a plane-type backlight including:

[0096] a first substrate and a second substrate being mounted apart fromeach other wherein gas is fed into space existing between the firstsubstrate and the second substrate and a portion surrounding the spaceis sealed in a hermetic manner;

[0097] a common electrode and a plurality of scanning electrodes beingmounted on the first substrate;

[0098] wherein a voltage is applied between the common electrode and thescanning electrode to cause discharging to occur in the space existingbetween the first substrate and the second substrate and wherein lightis emitted by exciting a fluorescent material being arranged between thefirst substrate and the second substrate and

[0099] a unit used to sequentially select one scanning electrodes out ofthe plurality of scanning electrodes.

[0100] In the foregoing, a preferable mode is one wherein, on the firstsubstrate, the common electrode and the plurality of the scanningelectrodes are formed in a same face and the belt-shaped scanningelectrode is arranged between common electrodes a plane of which is of acomb-teeth shape.

[0101] Also, a preferable mode is one wherein the common electrode andthe scanning electrode are stacked in layers with an insulating filminterposed between the common electrode and the scanning electrode on aside of the first substrate and wherein an opening is provided on theelectrode mounted on a first layer out of the electrodes being stackedin two layers.

[0102] Also, a preferable mode is one wherein at least one of the commonelectrodes and of the scanning electrodes is made up of a plurality ofbelt-shaped electrodes and a control electrode used to inhibit expansionof light emission is mounted between two belt-shaped electrodes adjacentto each other.

[0103] According to a fourteenth aspect of the present invention, thereis provided a discharging-type backlight for a liquid crystal displaydevice including:

[0104] an auxiliary discharging region existing adjacent to an outsideof a light emitting region for displaying in a light emitting region fordischarging in which scanning lines being adjacent to each other toinitiate light emitting for scanning do not emit light, which causesdischarging to occur immediately before initiation of at least lightemitting for scanning.

[0105] In the foregoing, a preferable mode is one wherein the auxiliarydischarging region keeps discharging continuously during light emissionfor scanning and discharging.

[0106] Also, a preferable mode is one wherein an area of an auxiliarydischarging electrode used to have discharging occur in the auxiliarydischarging region is smaller that that of an electrode used to emitlight for scanning and discharging.

[0107] Also, a preferable mode is one wherein a thickness of adielectric layer covering the auxiliary discharging electrode is greaterthan that of a dielectric layer covering an electrode used to emit lightfor scanning and discharging.

[0108] Also, a preferable mode is one wherein a fluorescent material isnot placed in a portion surrounding the auxiliary discharging region.

[0109] Also, a preferable mode is one wherein a partition wall is placedoutside of a light emitting region for discharging in which scanning isinitiated and invasion of light for discharging in a region in whichdischarging is kept continuously into a light emitting region forscanning is reduced.

[0110] Also, a preferable mode is one wherein a region in which lightemission for scanning is initiated is placed outside of a displayingregion.

[0111] Also, a preferable mode is one wherein an electrode fordischarging to initiate light emission for scanning is placed outside ofthe displaying region.

[0112] According to a fifteenth aspect of the present invention, thereis provided a method for driving a plane discharging-type backlightwhich includes a first glass substrate and a second glass substrate, afirst electrode formed on the first glass substrate, a second electrodeformed on the second glass substrate, at least one of which is coveredwith a dielectric layer, wherein gas is fed into space formed betweenthe first glass substrate and second glass substrate and a portionsurrounding the space is sealed in a hermetic manner and wherein avoltage is applied between the first and the second electrode to havedischarging occur in a space between the first and the second glasssubstrate and light is emitted by exciting a fluorescent material beingplaced between the first glass and the second glass substrate, themethod including:

[0113] a step of constructing at least one of the first and secondelectrodes to have discharging occur of a plurality of belt-shapedelectrodes; and

[0114] a step of applying a DC (direct current) voltage to onebelt-shaped electrode out of the plurality of belt-shaped electrodesduring light emission for scanning and discharging in a region in whichthe belt-shaped electrode emits light for discharging and of applying asine waveform voltage or a rectangular waveform voltage to an otherelectrode opposed to the belt-shaped electrode.

[0115] In the foregoing, a preferable mode is one wherein scanning isperformed on light emitting region for discharging by scanning a DCvoltage to be applied to the belt-shaped electrode.

[0116] Also, a preferable mode is one wherein intensity of light emittedfor scanning and discharging is varied by changing a DC voltage value tobe applied to the belt-shaped electrode.

[0117] Also, a preferable mode is one wherein a width of a region oflight emission for scanning is varied by changing a number ofbelt-shaped electrodes to which the DC voltage is applied.

[0118] Also, a preferable mode is one wherein luminance of light fedfrom the backlight is varied by changing a frequency of an AC(alternating current) voltage to be applied to the another electrode.

[0119] According to a sixteenth aspect of the present invention, thereis provided a liquid crystal display device having a liquid crystaldisplay section and a backlight described above and scanning on thebacklight and scanning on the liquid crystal display section areperformed in a same period.

[0120] According to a seventeenth aspect of the present invention, thereis provided a method for manufacturing a backlight including:

[0121] a step of forming a scanning electrode, a common electrode, and afluorescent layer on either of two substrates;

[0122] a step of forming a seal layer having a plurality of partitionson either of the two substrates; and

[0123] a step of collectively forming a plurality of backlight units bybonding the two substrates together and cutting the bonded twosubstrates for every sealing partition and by filling gas in a hermeticmanner into each sealing partition.

[0124] According to an eighteenth aspect of the present invention, thereis provided a method for manufacturing a backlight including:

[0125] a step of forming a scanning electrode, a common electrode, and afluorescent layer on either of two substrates;

[0126] a step of forming a seal layer having a plurality of partitionson either of the two substrates; and

[0127] a step of collectively forming a plurality of backlight units bybonding the two substrates together and filling gas in a hermetic mannerand then cutting the bonded two substrates filled with gas for everysealing partition.

[0128] With the above configuration, a scanning electrode is formedinternally in a backlight section and scanning is performed on a surfaceof the backlight section in a light emitting portion and, therefore, itis possible to reduce component counts, to simplify manufacturingprocesses, and to reduce costs. Also, since illuminating light emittedfrom the backlight is scanned and non-displaying period is provided, aperformance of displaying moving pictures is improved.

[0129] With another configuration, since one time scanning is performedon a screen in a liquid crystal display section within a predeterminedperiod and two or more times scanning are performed on a screen in abacklight, occurrence of a flicker can be prevented.

[0130] With still another configuration, since a protrusion is formed ona side of discharging space existing between electrodes facing eachother in a backlight, control can be exerted in a place in whichdischarge as seeds occurs and in a place in which strong dischargingoccurs, thus enabling uniform and stable discharging to be achieved.

[0131] With still another configuration, since an auxiliary dischargingarea is formed in a place being adjacent to a region being scanned in abacklight and, in this auxiliary discharging area, discharging occursimmediately before occurrence of discharging in a head portion of theregion being scanned, or discharging is maintained all the time and,since excited atoms and molecules, electrons, or ions serving as seedsof discharge are fed, it is possible to have discharging that rises in astable and speedy manner occur, as in the case of other region beingscanned.

[0132] With still another configuration, since redundancy is provided toa scanning light emission region in a backlight, high reliability isgiven to a displaying characteristic of a liquid crystal display panelwhich performs driving for scanning by using the backlight.

BRIEF DESCRIPTION OF THE DRAWINGS

[0133] The above and other objects, advantages, and features of thepresent invention will be more apparent from the following descriptiontaken in conjunction with the accompanying drawings in which:

[0134]FIG. 1 is a diagram illustrating an LCD according to a firstembodiment of the present invention;

[0135]FIG. 2 is a diagram illustrating an LCD according to a secondembodiment of the present invention;

[0136]FIGS. 3A and 3B are timing charts each explaining operations ofthe LCD of the second embodiment;

[0137]FIG. 4 is a diagram illustrating configurations of an LCDaccording to a fourth embodiment of the present invention;

[0138]FIGS. 5A and 5B are timing charts each explaining operations ofthe LCD of the fourth embodiment of the present invention;

[0139]FIG. 6 is a diagram illustrating configurations of an LCDaccording to a seventh embodiment of the present invention;

[0140]FIGS. 7A, 7B, and 7C are timing charts explaining the LCD of aninth embodiment of the present invention;

[0141]FIG. 8 is a diagram illustrating configurations of an LCDaccording to a twelfth embodiment of the present invention;

[0142]FIG. 9 is a diagram illustrating another configuration of the LCDaccording to the twelfth embodiment of the present invention;

[0143]FIG. 10 is a diagram illustrating still another configuration ofthe LCD according to the twelfth embodiment of the present invention;

[0144]FIG. 11 is a diagram illustrating configurations of an LCDaccording to an eighteenth embodiment of the present invention;

[0145]FIG. 12 is a diagram illustrating configurations of an LCDaccording to a twentieth embodiment of the present invention;

[0146]FIG. 13 is a diagram illustrating configurations of an LCDaccording to a twenty-first embodiment of the present invention;

[0147]FIG. 14 is a diagram illustrating configurations of an LCDaccording to a twenty-second embodiment of the present invention;

[0148]FIG. 15 is a diagram illustrating configurations of an LCDaccording to a twenty-fourth embodiment of the present invention;

[0149]FIG. 16 is a diagram illustrating configurations of an LCDaccording to a twenty-fifth embodiment of the present invention;

[0150]FIG. 17 is a diagram illustrating configurations of the LCDaccording to the twenty-fifth embodiment which is a cross-sectional viewof the LCD of FIG. 16 taken along a line A-A′.

[0151]FIG. 18 is a diagram illustrating configurations of the LCDaccording to the twenty-fifth embodiment which is a cross-sectional viewof the LCD of FIG. 16 taken along the line A-A′.

[0152]FIG. 19 is a diagram illustrating configurations of the LCDaccording to the twenty-fifth embodiment which is a cross-sectional viewof the LCD of FIG. 16 taken along the line A-A′.

[0153]FIG. 20 is a cross-sectional view illustrating configurations ofthe LCD of the twenty-sixth embodiment of the present invention;

[0154]FIG. 21 is a cross-sectional view illustrating configurations ofthe LCD of a twenty-seventh embodiment of the present invention;

[0155]FIG. 22 is a cross-sectional view illustrating configurations ofthe LCD of a twenty-eighth embodiment of the present invention;

[0156]FIG. 23 is a cross-sectional view illustrating configurations ofthe LCD of a twenty-ninth embodiment of the present invention;

[0157]FIG. 24 is an exploded view illustrating configurations of an LCDof a thirtieth embodiment of the present invention;

[0158]FIG. 25 is an exploded view illustrating configurations of abacklight of the thirtieth embodiment of the present invention;

[0159]FIG. 26 is a cross-sectional view explaining configurations of abacklight of a thirty-first embodiment of the present invention;

[0160]FIG. 27 is a cross-sectional view explaining configurations of thebacklight of the thirty-first embodiment of the present invention;

[0161]FIG. 28 is a cross-sectional view explaining configurations of abacklight of thirty-second to thirty-fourth embodiments of the presentinvention;

[0162]FIG. 29 is a cross-sectional view explaining configurations of abacklight of a thirty-fifth embodiment of the present invention;

[0163]FIG. 30 is a cross-sectional view explaining configurations of abacklight of a thirty-sixth embodiment of the present invention;

[0164]FIG. 31 is a cross-sectional view explaining configurations of abacklight of thirty-seventh and thirty-eighth embodiments of the presentinvention;

[0165]FIG. 32 is a diagram explaining wires for electrodes employed in athirty-ninth embodiment of the present invention;

[0166]FIG. 33 is a diagram illustrating a waveform of a driving voltageemployed in a fortieth embodiment of the present invention;

[0167]FIG. 34 is a cross-sectional view showing a backlight of aforty-first embodiment of the present invention;

[0168]FIG. 35 is a cross-sectional view schematically illustrating basicconfigurations of a gas discharging-type backlight of the embodiment ofpresent invention; and

[0169]FIGS. 36A to 36F are cross-sectional views explainingmanufacturing processes of a backlight of a forty-fifth embodiment ofthe present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0170] Best modes of carrying out the present invention will bedescribed in further detail using various embodiments with reference tothe accompanying drawings.

First Embodiment

[0171]FIG. 1 is a diagram illustrating an LCD according to a firstembodiment of the present invention. As shown in FIG. 1, the LCD of thepresent invention is provided with a liquid crystal display section 1and a backlight section 2 adapted to supply illuminating light to theliquid crystal display section 1, at a back of which a plurality ofscanning electrodes 3 is provided each performing scanning on a screenof both the liquid crystal display section 1 and of the backlightsection 2 at a same time. More particularly, the LCD is so configuredthat the scanning electrode 3 is mounted at a back of the backlightsection 2 and that, by scanning on a surface of the backlight section 2(see arrows representing a direction of “backlight scanning”), light isemitted in a region for the scanning electrode 3 that has been selected.By configuring above, reduction of component counts is achieved.Moreover, by providing a non-display period when scanning is performedon illuminating light emitted from the backlight section 2, aperformance of displaying moving pictures is improved.

[0172] In the LCD shown in FIG. 1, scanning directions on the backlightsection 2 and on the liquid crystal display section 1 are same. However,it is not always necessary that scanning directions on the backlightsection 2 and on the liquid crystal display section 1 are same. That is,in the LCD of the present invention, for example, as shown in FIG. 2,the scanning direction on the backlight section 2 (see the arrow forscanning on the backlight section 2) and the scanning direction on theliquid crystal display section 1 (see the arrow for scanning on theliquid crystal display section 1) may intersect at right angles eachother. Even by configuring above, same effects as obtained in the firstembodiment can be achieved.

Second Embodiment

[0173]FIG. 2 is a diagram illustrating an LCD according to a secondembodiment of the present invention. The LCD of the second embodiment ofthe present invention is made up of a liquid crystal display section 1and a backlight section 2, in which the backlight section 2 has aplurality of scanning electrodes 3 and a period of scanning on a screenof the liquid crystal display section 1 and a period of scanning on ascreen of the backlight section 2 are same in which scanning on thescreen of the liquid crystal display section 1 is performed once whilescanning is performed on the screen of the backlight section 2 “n”times.

[0174] The operation of the LCD of the second embodiment is explainedpresuming that n=2, by using FIGS. 3A-3B. In FIGS. 3A-3B, the period ofscanning on the screen of the liquid crystal display section 1 and aperiod of scanning on the backlight section 2 are same. Moreover, whilescanning on the screen of the backlight section 2 is performed twice(see FIG. 3B), scanning on the screen of the liquid crystal displaysection 1 is performed once (see FIG. 3A). Therefore, same informationis displayed on the screen of the liquid crystal display section 1 everytwo times' scanning on the screen of the backlight section 2.

[0175] Generally, the scanning on the screen of the liquid crystaldisplay section 1 is performed at a frequency of as low as 60 Hz. Whenthe scanning on the screen of the liquid crystal display section 1 andthe scanning on the screen of the backlight section 2 are performed insynchronization at this frequency (60 Hz), light luminance distributionof a display signal at the frequency of 60 Hz occurs. This is perceivedby a person seeing the displayed screen partially to be a flicker. Byperforming the scanning on the liquid crystal display section 1 and onthe backlight section 2 at a speed being twofold higher compared withthe conventional case and in a manner that the scanning on both theliquid crystal display section 1 and the backlight section 2 issynchronous, it is possible to prevent the occurrence of a flicker.

[0176] Moreover, as in the case of the LCD of the present invention, byperforming scanning on the liquid crystal display section 1 and thebacklight section 2 during a period corresponding to a frequency of 120Hz and then by suspending the scanning on the screen of the liquidcrystal display section 1 to perform only the scanning on the screen ofthe backlight section 2, the occurrence of the flicker can be prevented.

[0177] Thus, an example of operations occurring when n=2, that is, whenthe scanning on the screen of the liquid crystal display section 1 isperformed once while the scanning on the screen of the backlight section2 is performed twice within a predetermined period of time is explained.

[0178] By performing the scanning on the screen of the liquid crystaldisplay section 1 once and by performing the scanning on the screen ofthe backlight section 2 multiple numbers of times within a predeterminedperiod of time, it is also possible to prevent the flicker.

Third Embodiment

[0179] An LCD of a third embodiment of the present invention has ascanning mechanism in a backlight section made up of a group of lightemitting layers each having a different luminescent color and a scanningelectrode portion in the backlight section is constructed of a pluralityof kinds of scanning electrode groups each having a plurality ofscanning electrodes.

Fourth Embodiment

[0180]FIG. 4 is a diagram illustrating configurations of an LCDaccording to a fourth embodiment of the present invention. In the LCD ofthe fourth embodiment of the present invention, light emitting layersare spatially separated from each other on a principal face of thebacklight section 2 and each luminescent color is scanned independently.The LCD of the fourth embodiment is explained by referring to FIG. 4.

[0181] The luminescent colors in the backlight section 2 are provided ina form of a horizontal stripe and one of three primary colors (red,green, and blue) occurs every third color stripe. One piece of thehorizontal stripe for the luminescent color is handled as a scanningunit.

[0182] In the example shown in FIG. 4, a scanning unit in backlightsection 4 numbers 1, 4, and 7 represent the red color, the scanning unitin backlight section 4 numbers 2, 5, and 8 represent the green color,and the scanning unit in backlight section 4 numbers 3, 6, and 9represent the blue color. In FIG. 4, simply for the sake of conveniencein drawing pictures, each of the luminescent colors in red, green, andin blue is represented by patterns.

[0183] Scanning timing for operations of the LCD of the fourthembodiment is explained by referring to FIGS. 5A and 5B. As shown inFIGS. 5A and 5B, after the scanning on the screen of the liquid crystaldisplay section 1 has been performed (see FIG. 5A), the backlightsection 2 is scanned in order of the scanning unit numbers 1 to 4, andto 7 to complete display of the red color and then in order of thescanning unit numbers 2 to 5, and 8 to complete display of the greencolor and further in order of the scanning unit numbers 3 to 6, and to 9to complete display of the blue color (see FIG. 5B). This achievesdisplay of full colors.

Fifth Embodiment

[0184] In an LCD according to a fifth embodiment of the presentinvention, each of luminescent colors is provided spatially in aseparate manner within a face of the backlight and scanning is performedin unit of a plurality of light emitting layers each providing lighthaving a different luminescent color. Its operations are described byreferring to FIG. 4. In FIG. 4, scanning is performed on a set of thescanning units (1, 2, and 3) to have them emit light. Then, the scanningis performed on a set of the scanning units (4, 5, and 6) and then on aset of the scanning units (7, 8, and 9) to have them emit light.

[0185] By operating as above, light is emitted in a horizontal stripemanner in which the red, green,- and blue colors are arranged in anadjacent manner, thus enabling scanning on a screen to be performed.

[0186] Moreover, after having the set of the scanning units (1, 2, and3) emit light, it is possible to have the sets of the scanning units (2,3 and 4) and (3, 4, and 5) emit light.

[0187] Furthermore, in this embodiment, the scanning can be performed ona set containing different luminescent colors as one scanning unit suchas a scanning unit 4 shown in FIG. 6. In this case, scanning isperformed in order of the scanning numbers 1, 2, 3, 4, 5, 6, 7, 8, and 9to have them emit light.

Sixth Embodiment

[0188] An LCD of a sixth embodiment of the present invention isdescribed. In this embodiment, by changing light emitting time for eachof luminescent colors in a region in a scanning direction, a color tonein a region in a scanning direction is altered.

[0189] In the configuration shown in FIGS. 3A and 3B, light having asingle color is emitted for every one scanning unit. Therefore,highlighting of a red display on a screen can be achieved by lengtheninglight emitting time. Thus, by calibrating light emitting time for eachluminescent color, it is possible to create a screen having a desiredcolor tone.

Seventh Embodiment

[0190]FIG. 6 is a diagram illustrating configurations of the LCDaccording to the seventh embodiment of the present invention. The LCD ofthis embodiment is so configured that a width of screen scanning on aliquid crystal display section 1 is smaller than that of screen scanningon a backlight section 2. In the configuration shown in FIG. 6, thewidth of screen scanning on the backlight section 2 is set to be largerthan the width of screen scanning on the liquid crystal display section1. According to the seventh embodiment, the backlight section 2 can befabricated at lower costs because fine working on the backlight section2 is not required.

Eighth Embodiment

[0191] In an LCD of an eighth embodiment, a width of screen scanning ina backlight section 2 is approximately an integral multiple of that ofscreen scanning in a liquid crystal display section 1. In the LCD of theabove seventh embodiment, a width of screen scanning in the backlightsection 2 is larger than that of screen scanning in the liquid crystaldisplay section 1. However, it is necessary that timing for scanning onthe liquid crystal display section 1 synchronizes timing for scanning onthe backlight section 2. In order to achieve this, the width of screenscanning in the backlight section 2 is set to be an integral multiple ofthe width of screen scanning in the liquid crystal display section 1.Thus, by multiplying one scanning signal, another scanning signal can beproduced and the scanning can be synchronized with each other.

Ninth Embodiment

[0192]FIG. 7 is a timing chart explaining operations of an LCD of aninth embodiment of the present invention. In the LCD of the ninthembodiment, scanning on a screen of a backlight section 2 is performedin prior to scanning on a screen of a liquid crystal display section 1.When timing of scanning on the backlight section 2 is synchronized withtiming of scanning on the liquid crystal display section 1, scanning isperformed at a same frequency and in a same phase state. In FIGS. 7A,7B, and 7C, positions of scanning on a backlight section • (see FIG. 7B)and of scanning on the backlight section 2 (see FIG. 7A) are in a samephase and its phase lag is zero.

[0193] However, in general, response time required for lighting up thebacklight section 2 is shorter than that required for lighting up theliquid crystal display section 1. Therefore, if positions of scanning onthe backlight section and scanning on the liquid crystal display section1 match each other (see FIG. 7B), illumination by the backlight section2 is provided before a full response by the liquid crystal displaysection 1 is made.

[0194] In the LCD of the ninth embodiment, as shown as the position ofscanning on the backlight section •, a scanning phase in the backlightsection lags a scanning phase in the liquid crystal display section 1.By configuring as above, after a full response has been made in theliquid crystal display section 1, supply of backlight light is madepossible. This enables more clear images to be obtained. Thus, the LCDof the ninth embodiment can be applied not only when the scanning shownin FIG. 1 is performed, that is, when the direction of the scanning onthe liquid crystal display section 1 matches that of the scanning on thebacklight section 2 but also when the scanning shown in FIG. 2 isperformed, that is, when the direction of the scanning on the liquidcrystal display section 1 intersects that of the scanning on thebacklight section 2 at right angles.

Tenth Embodiment

[0195] In an LCD of a tenth embodiment, a liquid crystal display section1 is driven by a simple matrix form. In a simple matrix driven-type LCD,it is known that, as a number of scanning lines increases more, acontrast ratio becomes lower. In the case of the simple matrix form,application of an excessive voltage to a pixel on a non-selectedscanning line at a time of scanning on a screen causes low contrast.

[0196] However, in the liquid crystal display section 1 of the presentinvention, illuminating light for display is fed from a backlightsection 2 only to pixels existing in a vicinity of selected scanningline and no illuminating light for displaying is fed to an pixel on anon-selected scanning. Therefore, since display luminance of light fedfrom the pixel on the non-selected scanning line is lowered which causeslow contrast, a contrast ratio in the simple matrix driving-type LCD canbe improved.

[0197] The operation of an LCD having 1,000 pieces of scanning lines isdescribed as an example. When this LCD is driven by a simple matrix format a duty ratio of 1000, its contrast ratio becomes very low.

[0198] On the other hand, by using light having a width of a scanningline fed from the backlight being equivalent to ten pieces of thescanning lines in the liquid crystal display section 1 (by drivingcontrol on a scanning electrode existing at a back of the backlightsection), a contrast ratio being obtained by driving the LCD by a simplematrix at a duty ratio of about ten can be realized. Thus, according tothe present invention, even in the case of the simple matrix drivingLCD, a high contract ratio can be achieved.

Eleventh Embodiment

[0199] In an LCD of an eleventh embodiment, by changing light emittingtime in a region in a scanning direction, maximum luminance of light ina region being scanned is altered. Equal assignment of scanning lineselecting time in a backlight section to all scanning lines is notnecessary. For example, by assigning longer time for selection of thescanning line in a center of a screen of the backlight section 2,luminance of light in the center of the screen can be increased. Byoperating as above, light luminance distribution on a whole screen canbe set in a freely variable manner.

Twelfth Embodiment

[0200] In an LCD of a twelfth embodiment, at least one of a lightdiffusing layer 6 and at least one of a prism layer are provided betweena backlight section 2 and a liquid crystal display section 1.

[0201] If a scanning electrode is mounted at a back of the backlightsection 2, emitting of light in a region between the scanning electrodesis made difficult. As a result, uniform illuminating light on an entirescreen is made impossible.

[0202] In this embodiment, as shown in FIG. 8, the light diffusing layer6 is mounted between the backlight section 2 and a liquid crystaldisplay section 1 and light fed from the backlight section 2 is diffusedin a plane direction inside the light diffusing layer 6. By configuringabove, uniform illumination is achieved in a position corresponding to aregion between scanning electrodes.

[0203] Moreover, when the liquid crystal display section 1 issuperimposed on the backlight section 2, a moire stripe is produced.This occurs because a position and/or a pitch of a pixel of the liquidcrystal display section 1 does not match a position and/or a pitch ofthe scanning electrode existing at a back of the backlight section 2.

[0204] In order to solve these problems, the light diffusing layer 6 isincorporated which can effectively prevent the moire stripe.

[0205] Moreover, generally, light fed from the backlight section 2 isperfectly diffused light in many cases.

[0206] In the LCD of the twelfth embodiment, as shown in FIG. 9, asingle or a plurality of prism layers 7 is mounted to change perfectlydiffused light into light having directivity.

[0207] In this case also, due to nonconformity in a pitch among theprism layers 7, the scanning electrode existing at a back of thebacklight section 2, and pixels in the liquid crystal display section 1,the moire stripe occurs in some cases. To avoid this problem, combineduse of the prism layer 7 and light diffusing layer 6 may be employed.

[0208] In the LCD of the twelfth embodiment in which both the prismlayer and light diffusing layer are employed, as shown in FIG. 10, thebacklight section 2, prism layer 7, light diffusing layer 6, and theliquid crystal display section 1 are stacked in layer in this order.

Thirteenth Embodiment

[0209] As light to be fed from a backlight section 2, light generated bydischarge in a gas is used. In this case, discharging occurs between aplurality of scanning electrodes and a plurality of common electrodes.Moreover, by creating a plurality of partitions within the backlightsection 2 and feeding various kinds of gases into the partitions in ahermetic sealed manner, a plurality of luminescent colors can beobtained.

Fourteenth Embodiment

[0210] In an LCD of a fourteenth embodiment of the present invention, aslight to be fed from a backlight section 2, fluorescent light emittedfrom a fluorescent material (phosphor) excited by light produced throughdischarge in a gas is used. In this case, discharging occurs between aplurality of scanning electrodes and a plurality of common electrodes.Single gas is fed into the backlight section 2 in a sealed manner.Moreover, by changing a color of a fluorescent material using a printingprocess, a different luminescent color can be obtained.

Fifteenth Embodiment

[0211] In an LCD of a fifteenth embodiment, as light to be fed from abacklight section 2, light generated by discharge in a gas is used. Thelight, after having passed through a liquid crystal display section 1,enters a fluorescent material. In this case, a fluorescent materiallayer is arranged on a front of the liquid crystal display section. Acolor of the fluorescent layer is changed by using a fluorescentmaterial having a different luminescent color in a plane direction. Thisenables display of full colors.

Sixteenth Embodiment

[0212] In an LCD of a sixth embodiment, as light to be fed from abacklight section 2, light produced by accelerating electrons in avacuum and by having light generated by the acceleration of electronsenter a fluorescent material is used. In the embodiment, an insideportion of the backlight section 2 is maintained under vacuum andscanning electrodes each being able to scan an electron source areprovided therein. Moreover, arrangement is made so that an electron beamfrom the electron source is guided into a fluorescent layer. By changinga color of the fluorescent layer, the backlight section 2 having a planeface portion adapted to emit light having a different luminescent colorcan be achieved.

Seventeenth Embodiment

[0213] In an LCD of a seventeenth embodiment, as light to be fed from abacklight section 2, electroluminescent light is used. In theembodiment, an electroluminescent material made of an organic materialor inorganic material is used for backlight. By changing a color of alight emitting layer made of the electroluminescent material, lightproviding a different luminescent color can be obtained within a face.Moreover, by placing a scanning electrode group and a mechanism to driveit, a backlight section 2 being capable of performing scanning isobtained.

Eighteenth Embodiment

[0214] An LCD of an eighteenth embodiment has an anti-EMI(Electromagnetic Interference) filter between a liquid crystal displaysection 1 and a backlight section 2.

[0215] Ordinarily cases, electromagnetic interference occurs in abacklight section irrespective of its type. As a result, noise or a likeare produced in the liquid crystal display device which causes a displayfailure. In the LCD of the above embodiments, since a scanning electrodeis placed for scanning, such the display failure presents a seriousproblem. In order to solve this problem, according to the eighteenthembodiment, as shown in FIG. 11, the anti-EMI filter layer 8 is placedbetween the backlight section 2 and the liquid crystal display device 1which prevents occurrence of the display failure.

Nineteenth Embodiment

[0216] An LCD of a nineteenth embodiment has an anti-EMI filter layer 8within a liquid crystal display section 1. As the anti-EMI filter layer8, a mesh-shaped conductor is preferably used. The mesh-shaped conductorcan be easily fabricated in a thin film producing process performed in aliquid crystal display section 1.

[0217] When the anti-EMI filter layer is mounted outside of the liquidcrystal display section 1, a problem of a moire stripe caused by pitchdrifts arises.

[0218] However, in the LCD of the present invention, since the anti-EMIfilter layer 8 is mounted within the liquid crystal display section 1,the anti-EMI filter layer 8 can be fabricated so as to have a positionof the anti-EMI filter layer 8 be matched with the liquid crystaldisplay section 1, which effectively serves for removing a moire stripe.

Twentieth Embodiment

[0219] In an LCD of a twentieth embodiment, as shown in FIG. 12, atleast, a backlight section 2, an anti-EMI filter layer 8, a lightdiffusing layer 6, and a liquid crystal display section 1 are providedin this order.

[0220] If the anti-EMI filter layer 8 is mounted outside of the liquidcrystal display section 1, a moire stripe is produced by a mesh-shapedconductor of the anti-EMI filter layer 8 and by a liquid crystal displaysection 1. To avoid this, as shown in FIG. 12, the light diffusing layer6 between them is placed, which effectively prevents occurrence of themoire stripe.

Twenty-First Embodiment

[0221] In an LCD of a twenty-first embodiment of the present invention,as shown in FIG. 13, an infrared ray absorbing filter layer 9 or aninfrared ray reflecting filter layer 9 is placed between a liquidcrystal display section 1 and a backlight section 2.

[0222] Generally, an infrared ray is emitted, besides visible light,from a backlight section 2 at a same time. In some cases, this causesdeterioration of the liquid crystal display section 1 or overheatingphenomenon in the liquid crystal display section 1.

[0223] In the LCD of the embodiment, as shown in FIG. 13, the filterlayer 9 absorbing or reflecting an infrared ray 9 is placed between theliquid crystal display section 1 and the backlight section 2. Byconfiguring as above, the occurrence of overheat in the liquid crystaldisplay section 1 is avoidable.

Twenty-Second embodiment

[0224] In an LCD of the embodiment, a side at which there is placed aterminal portion of each of the plurality of scanning lines and theplurality of the signal lines in the liquid crystal display section aredifferent from a side at which there placed a terminal portion of theplurality of the scanning electrodes in the backlight section 2.

[0225]FIG. 14 is a diagram illustrating configurations of the LCDaccording to the twenty-second embodiment of the present invention. Byreferring to FIG. 4, configurations of the LCD of the twenty-secondembodiment are described.

[0226] In the liquid crystal display 1, a scanning line and a signalline have to be connected to an external circuit. Moreover, in the LCDof the embodiment, terminal portions taking out the scanning electrodeline and common electrode line in the backlight section 2 is required.It is necessary that, by performing positioning and positionaladjustment of both the lines, they are superimposed on each other. As aresult, when compared with a conventional liquid crystal display device,more complicated taking-out of wires is required.

[0227] In the LCD of the embodiment, a scanning line of the liquidcrystal display section 1 is taken from one side out of four sides ofthe liquid crystal display section 1 and a signal line is taken fromother two sides out of the four sides and a scanning line of thebacklight section 2 is arranged on a side except these three sides. Thisenables compact mounting.

Twenty-Third Embodiment

[0228] In the twenty-third embodiment as a backlight, a plane-typebacklight is used in which gas is fed into a space between a firstsubstrate and a second substrate and portions surrounding the space aresealed in a hermetic manner and wherein a common electrode is placed onthe first substrate and a plurality of scanning electrodes is placed onthe second substrate and a voltage is applied between electrodes tocause charging to occur in the space between the substrates and light isemitted from a fluorescent material placed between the substrates byexcitation and wherein scanning mechanism to sequentially select thescanning electrode is provided.

Twenty-Fourth Embodiment

[0229] In an LCD of a twenty-fourth embodiment, a backlight is anelectrode formed so that common electrodes are at same potential on anentire light emitting face of a backlight. FIG. 15 is a diagramillustrating configurations of the LCD according to the twenty-fourthembodiment of the present invention. As shown in FIG. 15, in theembodiment, a common electrode 14 is placed so as to cover an entiresurface of one substrate 21. On another substrate 22 is formed aplurality of scanning electrodes 3 and on a side of the substrate 22being opposite to the substrate 21 is provided a fluorescent light layer5, which make up a backlight section 2. Moreover, in the example of FIG.1, though the common electrode 14 is placed on an outside of a gas layer12, the common electrode 14 may be fabricated on a side of the gas layer12 of the substrate 21.

Twenty-Fifth Embodiment

[0230] In an LCD of a twenty-five embodiment, a backlight is made up ofa plurality of belt-shaped common electrodes placed on one electrode anda plurality of belt-shaped scanning electrodes placed on anotherelectrode wherein each of the common electrodes and each of the scanningelectrodes are arranged in a same direction. FIG. 16 is a diagramillustrating configurations of the LCD according to the twenty-fifthembodiment of the present invention. As shown in FIG. 16, the pluralityof common electrodes 14 on the substrate 21 is commonly connected to oneanother and are arranged in parallel. On a substrate 22 is arranged aplurality of scanning electrodes 3 in parallel.

[0231]FIG. 17 is a diagram illustrating configurations of the LCDaccording to the twenty-fifth embodiment which is a cross-sectional viewof the LCD of FIG. 16 taken along a line A-A′. The LCD of thetwenty-fifth embodiment is provided with the substrate 21 having aplurality of the common electrodes 14 (belt-shaped electrode) arrangedin parallel and the substrate 22 having a plurality of scanningelectrodes 3 and wherein a fluorescent material layer 5 is placed on aface of the substrate 21 being opposite to the substrate 22 and a gaslayer 12 is provided so as to be sandwiched between the substrates 21and 22.

[0232] In the embodiment, modified LCDs as shown in FIG. 18 and FIG. 19may be employed so long as it is so configured that the belt-shapedelectrode can be driven for scanning.

[0233] As shown in FIG. 18, the modified LCD is provided with thesubstrate 22 having a plurality of scanning electrodes 3 and thesubstrate 21 having a plurality of common electrodes 14 (belt-shapedelectrode) placed in parallel to one another on a face of the substrate21 being opposite to the substrate 22 and wherein on a face of thesubstrate 21 being opposite to the substrate 22 is formed thefluorescent material layer 5 in a manner that it covers the commonelectrode 14 and a gas layer 12 is provided in space between thesubstrates 21 and 22.

[0234] As shown in FIG. 19, another modified LCD is provided with thesubstrate 22 having a plurality of scanning electrodes 3 and afluorescent material layer 5 formed in a manner that it covers scanningelectrodes 3 and the substrate 21 having common electrodes 14(belt-shaped electrode) placed in parallel to one another on a face ofthe substrate 22 being opposite to the substrate 21 and wherein on asurface of the substrate 21 being opposite to the substrate 22 is formedthe fluorescent material layer 5 in a manner that it covers the commonsubstrate 14 and wherein the gas layer 12 is provided in space betweenthe substrates 21 and 22.

Twenty-Sixth Embodiment

[0235] In an LCD of a twenty-six embodiment, common electrodes 14 aremade up of a plurality of belt-shaped electrodes placed in one directionand scanning electrodes 3 are also made up of a plurality of belt-shapedelectrodes placed in one direction and wherein both the commonelectrodes 14 and scanning electrodes 3 are deviated positionally fromeach other by a half period (a half pitch). In the LCD of thetwenty-fourth embodiment, discharging in space between the scanningelectrodes 3 does not occur easily.

[0236] However, in the LCD of the twenty-sixth embodiment, as shown inFIG. 20, the common electrodes 14 and the scanning electrodes 3 aredeviated positionally from each other by a half period (half pitch) andwherein the scanning electrodes 3 are formed in a position correspondingto a region in which the common electrodes 14 are not formed. The LCD ofthe twenty-sixth embodiment can be applied to the embodiments shown inFIG. 17 and FIG. 19.

Twenty-Seventh Embodiment

[0237] An LCD of a twenty-seventh embodiment has a protrusion 15protruding toward discharging space on a dielectric layer formed atleast on one side of a common electrode 14 or of a scanning electrode 3.FIG. 21 is a cross-sectional view illustrating configurations of the LCDof the twenty-seventh embodiment of the present invention. As shown inFIG. 21, the protrusion 15 is provided on a surface of a plurality ofscanning electrodes 3 formed on a substrate 22.

[0238] By placing the protrusion 15 on a side of discharging spacebetween electrodes facing each other, control can be exerted on a placewhere discharge as seeds is produced and on a place where intensedischarging occurs, uniform and stable discharging can be achieved.

[0239] Same effects as obtained in the above embodiment can be obtainednot only by mounting a discharging electrode on a dielectric layer beinginsulated from discharging space but also by mounting the protrusion 15on an electrode being exposed in the discharging space and by coveringthe protruded electrode with the dielectric layer and by partiallymaking smaller a thickness of the dielectric layer and by placing aprotrusion on a surface of a fluorescent material.

Twenty-Eighth Embodiment

[0240] In an LCD of a twenty-eighth embodiment, both a common electrode14 and a scanning electrode 13 are made up of a plurality of belt-shapedelectrodes being placed in a same direction and each of the belt-shapedelectrodes serves as a backlight corresponding to light having one of R,G, B colors.

[0241] As shown in FIG. 22, by changing a color of a fluorescentmaterial layer 5, a color of fluorescent light can be changed in aposition of the scanning electrode 3 selected for scanning. In thiscase, scanning on each of the R, G, and B colors can be performed.

[0242] In the example shown in FIG. 22, the fluorescent material layer 5is placed on a side of the common electrode 14, however, it may beplaced on a side of the scanning electrode 3. Moreover, it may be placedon both the electrode substrates 3,14.

Twenty-Ninth Embodiment

[0243] In an LCD of a twenty-eighth embodiment, a common electrode 14and a scanning electrode 3 are belt-shaped electrodes almostintersecting each other at right angles and each of the belt-shapedelectrodes serves as a backlight corresponding to luminescent color outof R, G, B colors.

[0244] As shown in FIG. 23, in an LCD of the twenty-ninth embodiment,both the common electrode 14 and the scanning electrode 3 are made up ofbelt-shaped electrodes intersecting at right angles each other (a seriesof belt-shaped electrodes placed in a horizontal direction). In thiscase, scanning can be performed on each of the colors R, G, and B.

Thirtieth Embodiment

[0245] As a backlight employed in a thirtieth embodiment, a plane-typebacklight is used in which gas is fed into space between a firstsubstrate and a second substrate and a portion surrounding the spacefilled with the gas is sealed in a hermetic manner in which a commonelectrode 14 and a plurality of scanning electrodes 3 are mounted on thefirst substrate and discharging occurs in space between the substratesby a voltage applied between electrodes and a fluorescent materialarranged between the substrates is excited to emit light and in whichthe backlight has a scanning mechanism which sequentially selects ascanning electrode 3. FIGS. 24 and 25 are an exploded view illustratingconfigurations of the backlight of the embodiment.

[0246] In the example shown in FIG. 24, the common electrode 14 and thescanning electrode 3 are placed on a same substrate 22. The commonelectrode 14 is of a comb-teeth shape and between the common electrodes14 are arranged belt-shaped scanning electrodes 3.

[0247] Moreover, in the example shown in FIG. 25, the common electrode14 and the scanning electrode 3 are stacked in layers with an insulatingfilm 23 sandwiched between the common electrode 14 and the scanningelectrodes 3. To induce discharging, an opening 16 is formed on thescanning electrode 3 and the insulating film 23.

Thirty-First Embodiment

[0248] In the backlight employed in a thirty-first embodiment, at leastone of a common electrodes 14 and a scanning electrodes 13 are made upof a plurality of belt-shaped electrodes and among the belt-shapedelectrodes is arranged an electrode which inhibits expansion of emittedlight. FIGS. 26 and 27 are cross-sectional views explainingconfigurations of the backlight of the thirty-first embodiment of thepresent invention. Cutting plane lines A-A′ in FIGS. 26 and 27correspond to an A-A′ line shown in FIG. 16. In the example shown inFIG. 26, the common electrodes 14 are placed on the substrate 21 and thescanning electrodes 3 on a substrate 22. In the example shown in FIG.27, the common electrodes 14 and the scanning electrodes 3 are placed ona same substrate 22.

[0249] Discharging occurs between a pair made up of the commonelectrodes 14 and the scanning electrodes 3. A control electrode 17 isplaced between the scanning electrodes 14. In the example in FIG. 26,another control electrode 17 is placed between the scanning electrodes 3and the common electrodes 14 on the substrate 22. This preventsdischarging between neighboring electrodes, thus enabling localizationof discharging space.

[0250] In the example shown in FIG. 27, the scanning electrodes 3 andthe common electrodes 14 are arranged in a same manner on the substrate22 and the control electrode 17 is placed between a pair of the scanningelectrodes 3 and a pair of the common electrodes 14. This preventsdischarging between neighboring electrodes, thus enabling localizationof discharging space. A fluorescent material layer 5 is formed in amanner so as to cover the scanning electrodes 3 and the commonelectrodes 14.

[0251] The configuration using the control electrode 17 shown in FIG. 26can be applied to configurations of the electrode shown in FIGS. 15, 16,and 24. Moreover, the configuration using the control electrode 17,irrespective of arrangement of the fluorescent material, can be appliedto configurations shown in FIGS. 1, 8, and 19.

Thirty-Second Embodiment

[0252] As a backlight employed in a thirty-second embodiment, as shownin FIG. 28, a discharging-type backlight is used which is placedadjacent to an outside of a display light emitting area in a discharginglight emitting region in which a neighboring scanning line to startemitting of light for scanning does not emit light and which has anauxiliary discharging area to have discharging occur immediately beforea start of emitting light for scanning. FIG. 28 shows a part of across-section in discharging light emitting region of the backlighthaving a first glass substrate 101 and a second glass substrate 201. Onthe first substrate 101 are placed a common electrode 102 and atransparent dielectric layer 103 and on the second substrate 201 areplaced a scanning electrode 202, a white dielectric layer 203, and afluorescent material layer 204. Moreover, in the auxiliary dischargingarea are provided an auxiliary discharging electrode 104 and a lightintercepting section 105. A seal member 116 is also provided as shown inFIG. 22.

Thirty-Third Embodiment

[0253] A discharging-type backlight continues, all the time, dischargingin an auxiliary discharging area during a period of emitting light forscanning and discharging.

[0254] In a head portion in which scanning is initiated, since time haselapsed after a previous discharging and since no discharging occurs inan neighboring scanning line, if there is no discharging in asurrounding area, discharging does not occur readily.

[0255] Next, as shown in FIG. 28, adjacent to a region being scanned ofthe above head portion is formed an auxiliary discharging region inwhich, by having discharging occur immediately before occurrence ofdischarging in the region being scanned of the head portion or bymaintaining discharging continuously and supplying excited atoms andmolecules, electrons, and ions serving as seeds of discharge (that is,by using a priming effect), it is possible to start discharging thatrises in a stable and speedy manner, as in the case of discharging inother region being scanned.

Thirty-Fourth Embodiment

[0256] A discharging-type of a thirty-fourth embodiment, as shown inFIG. 28, is so configured that an area of an auxiliary dischargingelectrode 104 used to have discharging occur in an auxiliary dischargingarea is smaller than that of an scanning electrode 202 used to emitlight for scanning and discharging or that a thickness of a dielectricmaterial layer used to coat an auxiliary discharging electrode 104 islarger than that of a dielectric material layer used to coat anelectrode to emit light for scanning and discharging.

Thirty-Fifth Embodiment

[0257] In a discharging-type backlight to be used for a liquid crystaldisplay device, a fluorescent material is not placed in an areasurrounding an auxiliary discharging region. It is preferable thatintensity of discharging occurring in the auxiliary discharging area isas small as possible. Therefore, by making an area of an electrode usedto have auxiliary discharging occur be narrower than that of a scanningelectrode or by making a thickness of a dielectric material layercovering an electrode be larger than that of a scanning section, theintensity of the auxiliary discharging can be properly controlledwithout reducing a priming effect.

[0258] As shown in FIG. 29, by configuring the backlight so that afluorescent material layer 204 is not placed in an auxiliary dischargingregion, it is possible to prevent light from a fluorescent materiallayer emitted by auxiliary discharging from turning around a regionbeing scanned or around a displaying region.

Thirty-Sixth Embodiment

[0259] In a discharging-type backlight to be used for a liquid crystaldisplay device, a partition wall 106 to reduce invasion of discharginglight into a region of light emitting for discharging and scanning in aregion in which discharging is maintained continuously (see FIG. 30) isplaced outside of a discharging light emitting region in whichdischarging is started. FIG. 30 is a cross-sectional view explainingconfigurations of the backlight of the thirty-sixth embodiment. As shownin FIG. 30, by separating an auxiliary discharging region from a regionbeing scanned using a shielding structure such as the partition wall 106in a range in which a priming effect can be obtained, it is possible toreduce a detriment that a fluorescent material in the region beingscanned excited by ultraviolet rays produced by an auxiliary discharge,whereby fluorescent light is emitted from the fluorescent material.

Thirty-Seventh and Thirty-Eighth Embodiments

[0260] In a discharging-type backlight employed in the thirty-seventhand thirty-eighth embodiments, a region in which scanning light emissionis initiated is placed outside of a discharging region. A dischargingelectrode to initiate scanning light emission is placed outside of thedischarging region.

[0261] When a region in which the scanning light emission is initiatedis matched with a displaying region without redundancy, due to a specialcharacteristic of a head portion of light for scanning, a characteristicof the light emitted in this region is different from that in otherregions.

[0262] As shown in FIG. 31, by using a scanning light emitting regionbeing larger than a displaying region, light emitted for discharging ina head portion of light for scanning is not used for displaying and onlya region of light emitting for scanning providing a uniform and stablestate can be used and therefore stabilization of displaying and highimage quality can be obtained. Such a configuration can be achieved byplacing a scanning and discharging electrode outside of a displayingregion.

Thirty-Ninth Embodiment

[0263] A method for driving a discharging-type backlight employed in athirty-ninth embodiment in which an electrode at least one end of whichis covered by a dielectric is placed on a first and second glasssubstrate 201, gas is fed into a space being provided between the firstglass substrate 101, a portion surrounding the space is sealed,discharging occurs in the space between the first glass substrate 101 byapplication of a voltage and light is emitted by exciting a fluorescentmaterial being arranged between the substrates, includes a step ofconstructing at least one electrode to have the above discharging occurby using a plurality of belt-shaped electrodes, of applying a DC (directcurrent) voltage to one electrode out of the belt-shaped electrodesduring light emission for scanning and discharging in a region in whichthe belt-shaped electrode emits light for discharging and of applying asine waveform voltage or a rectangular waveform voltage to otherelectrode. FIG. 32 is a diagram explaining wires for electrodes of athirty-ninth embodiment of the present invention. As shown in FIG. 32, ascanning bias voltage is fed to a scanning electrode group 301 beingconnected to a scanning bias voltage switch 303 being in an ON state anda common signal (alternating voltage) is input to a common electrodegroup 302.

[0264] By changing a potential in an electrode to which a DC voltage isapplied corresponding to an intermediate potential of an alternatingvoltage to be applied to other electrode, an amplitude of thealternating voltage at each polarity to be applied to the electrode towhich the DC voltage has been applied can be varied.

[0265] Discharging occurs by application of an alternating voltage ofseveral MHz or less between electrodes at least one end of which iscovered by a dielectric. The discharging occurs when the alternatingvoltage exceeds a threshold voltage and has a dielectric bear electricalcharges so as to generate a voltage having a reverse polarity betweenelectrodes and is terminated.

[0266] A subsequent alternating voltage applied from an outside issuperimposed on a voltage produced by charging with electricity, whichcauses occurrence of a subsequent discharging and a voltage having areverse polarity to be generated between electrodes and the dischargingis terminated.

Fortieth Embodiment

[0267] In a method for driving a backlight for an LCD which scans aregion of light emitting for discharging, a DC voltage to be applied toa belt-shaped electrode is scanned. FIG. 33 is a diagram illustrating awaveform of a driving voltage employed in the fortieth embodiment of thepresent invention.

[0268] Discharging continues in a stable state when a potential in anelectrode (for example, scanning electrode) to which a DC voltage isapplied is at an intermediate potential of an alternating voltageapplied to other electrode (for example, common electrode). By applyinga DC voltage in a manner that the applied voltage is drifted from theintermediate potential of the alternating voltage to other electrode, itis made possible that a threshold voltage is not exceeded even if asuperimposing voltage by charging with electricity is contained.

[0269] Thus, a discharging occurring region can be controlled bychanging a DC voltage. By scanning a DC voltage to be applied to abelt-shaped electrode of the scanning electrode with an amplitude of analternating voltage maintained at a constant level using the abovedischarging control mechanism, scanning can be performed on a region oflight emitting for discharging.

Forty-First Embodiment

[0270] In a method for driving a backlight for an LCD, intensity oflight emitted for scanning and discharging is varied by changing a DCvoltage to be applied to a belt-shaped electrode.

[0271]FIG. 34 is a cross-sectional view showing a backlight of aforty-first embodiment of the present invention. By setting a DC voltageso as to be drifted from an intermediate potential within a range inwhich discharging occurs, it is possible to change the intensity oflight emitted for scanning and discharging, that is, average luminanceof light fed from the backlight. A DC voltage to be supplied to ascanning electrode group 301 through a scanning bias voltage switch 303is made variable.

Forty-Second Embodiment

[0272] In a method for driving a backlight of a forty-second embodiment,a width of a region of light emitting for scanning is varied by changinga number of belt-shaped electrodes to which a DC voltage is applied. Bychanging a number of the belt-shaped electrode to which a DC voltage isapplied, it is made possible to change a width of the region of lightemitted for scanning and to change average luminance of light fed fromthe backlight.

Forty-Third Embodiment

[0273] In a method for driving a backlight of a forty-third embodiment,by changing a frequency of an alternating voltage to be applied to oneelectrode, luminance of light fed from the backlight is changed. Sincean alternating voltage is applied only to the one electrode by employingthe method of the forty-third embodiment, a frequency can be changedeasily and independently without an influence on other characteristicsand calibration of luminance of light fed from the backlight can beeasily made.

Forty-Fourth Embodiment

[0274] An LCD of a forty-fourth embodiment is provided with a liquidcrystal display section and a discharging-type backlight havingcharacteristics described in above other embodiments and scanning isperformed on the backlight and the liquid crystal display section in asame period.

Forty-Fifth Embodiment

[0275] In a method for manufacturing a backlight section employed in aforty-fifth embodiment, a plurality of backlight units is manufacturedcollectively, as shown in FIGS. 36A and 36B, by forming unit portions ofa plurality of backlight units having scanning electrodes 307, a commonelectrode 313, a dielectric layer, and a fluorescent layer 312 making upa discharging-type backlight on either of two substrates an uppersubstrate 314 and a lower substrate 315, by forming a sealing layer in amanner that it surrounds a region in which discharging occurs in thisunit portion and then feeding gas into each unit portions obtained bybonding and cutting the upper substrate 314 and the lower substrate 315or by feeding gas into a substrate obtained by bonding two substratestogether and then by cutting the bonded substrate.

[0276]FIG. 36 is a cross-sectional view explaining manufacturingprocesses of the backlight of the forty-fifth embodiment of the presentinvention.

[0277] As shown in FIG. 36A, the scanning electrode 307 is formed on thelower substrate 315 and a common electrode 313 is formed on the uppersubstrate 314. As shown in FIG. 36B, the fluorescent layer 312 isformed.

[0278] As shown in FIG. 36C, a seal member 316 is mounted on the lowersubstrate 315 and a spacer 317 (for example, glass-like spacer) on theupper substrate 314 Thus, a plurality of unit portions of the backlightis prepared. In the example shown in FIGS. 36A to 36F, a plurality ofscanning electrodes 307 and one common electrode 313 are mounted in eachunit portion.

[0279] Then, as shown in FIG. 36D, the upper substrate 314 and the lowersubstrate 315 are stuck.

[0280] Next, as shown in FIG. 36E, each of the unit portion is cut forseparation.

[0281] Then, as shown in FIG. 36F, gas is fed through a gas feeding hole318 in a hermetic manner. An alternative method is that after the twosubstrates have been stuck and inert gas has been fed therein, cuttingis made in each of unit portions.

[0282] Moreover, each of the unit portions is connected to a scanningdriving system of the backlight section. Then, positional calibrationrelative to a liquid crystal display section 1 is made to achievearrangement in stacked layers.

[0283] At this point, connection is established so that the scanningdriving system of the backlight section synchronizes with that of theliquid crystal display section 1. By operating above, by performing onetime assembling process, a plurality of backlight sections can beobtained. This enables an LCD in which scanning by the liquid crystaldisplay section is synchronized with scanning by the backlight sectionto be provided at low costs.

EXAMPLE

[0284] An example of the present invention will be described below. FIG.35 is a cross-sectional view schematically illustrating basicconfigurations of a gas discharging-type backlight used in the presentinvention. In FIG. 35, in the backlight of the example of the presentinvention, a common electrode 102 made up of a transparent conductivefilm made by using an indium oxide or tin oxide as a main ingredient isformed on an entire surface of a displaying region of a first glasssubstrate 101. The first glass substrate 101 and the common electrode102 make up a front glass substrate 100.

[0285] On a second glass substrate 201 is formed, in order to control aregion of emitted light, short-book shaped scanning electrodes 202fabricated by using a metal thin film or metal particles as a mainingredient which are arranged in parallel in a direction travelingstraight to a scanning direction or a metal fine particle, on which awhite dielectric layer 203 is formed and finally a fluorescent materiallayer 204 to emit light by being excited using ultraviolet rays isformed. The second glass substrate 201, the scanning electrode 202, thedielectric layer 203, and the fluorescent material layer 204 make up arear substrate 200.

[0286] In the example, the fluorescent material layer 204 is made up ofa three-waveform light emitting fluorescent material so that visiblelight fed from the fluorescent material layer 204 can be suitablyapplied to a color filter in a liquid crystal section and light having awhite color is emitted.

[0287] The front glass substrate 100 and the rear glass substrate 200are stuck to each other with a spherical glass spacer sandwiched betweenthe font glass substrate 100 and the rear glass substrate 200 in amanner that an interval between the front glass substrate 100 and therear glass substrate 200 making up a discharging space 300 is kept at aconstant length. The discharging space 300 is filled with gas containingan inert gas as a main ingredient by using frit glass in a portionsurrounding a backlight in a hermetic manner.

[0288] In the above example, the common electrode 102 is formed on anentire surface being opposite to the discharging space 300 existing onthe first glass substrate 101.

[0289] The common electrode 102 may be formed on a side of thedischarging space 300 or may be formed in a same direction asarrangement of the scanning electrode 202 or in a direction orthogonalto the scanning electrode 202 in a short-book form.

[0290] These configurations are possible so long as discharging occursby a voltage being applied between the common electrode 102 and thescanning electrode 202 and a discharging current is limited by adielectric layer being placed between electrodes or by a glass substratebefore a breakdown of the dielectric layer occurs (this operation beingcalled “dielectric barrier discharging”.

[0291] Moreover, it is necessary that electrodes being placed on a sideof a displaying face, irrespective of whether it is the common electrode102 or the scanning electrode 202, are so configured as to fully passvisible light fed from a fluorescent material and therefore theelectrodes existing on a side of the displaying face are made of atransparent conductive material, a metal mesh, or a like.

[0292] The scanning electrode 202 or the white dielectric layer 203 isconstructed of materials that can effectively guide light fed from afluorescent material to a side of the displaying face. It is desirousthat the white dielectric layer 203 contains fine particles with a highrefractive index such as titanium oxide and the scanning electrode 202is constructed of materials with a high rate of reflection for visiblelight such as silver, aluminum, or a like.

[0293] In a case where the scanning electrode 202 on a side of the rearsubstrate 200 is formed on an entire surface of a displaying region in aplane form, instead of the white dielectric layer 203, a transparentdielectric layer may be used.

[0294] Moreover, the scanning electrode 202, if being of a short-bookshape, may be so configured that no dielectric layer is mounted on ametal electrode or that a transparent dielectric layer is formed or thata white dielectric layer is formed in a region where no metal portionbetween electrodes is formed.

[0295] The fluorescent material layer 204 may be formed not only on therear substrate 200 but also on the front substrate 100 on the displayingface.

[0296] Also, the fluorescent material layer 204 may be constructed ofnot a visible light emitting fluorescent layer but an ultraviolet rayemitting fluorescent material or may be so configured that ultravioletrays being generated by discharge in a gas are taken out as light fedfrom the backlight and are used for scanning.

[0297] Next, an example of a method for manufacturing thedischarging-type backlight is described below.

[0298] The common electrode 102 is fabricated by forming a transparentconductive film containing indium oxide as a main ingredient on a frontsurface of the first glass substrate 101 and by performing patterning onthe resulting transparent conductive film by etching technique using aphotoresist.

[0299] The (patterned) common electrode 102 has an electrode portionsection outside of the displaying region.

[0300] The common electrode 102 is placed in a manner that it is notexposed in the discharging space 300 at least in the displaying regionand is fabricated by forming a dielectric paste containing a materialwith a low melting point as a main ingredient by using a screen printingmethod and by coating a baked transparent dielectric layer with thedielectric paste.

[0301] On the other hand, on the second glass substrate 201 is formedthe scanning electrode 202 fabricated by performing patterning on aconductive paste containing Ag (silver) particles as a main ingredientby using the screen printing method and by coating the second glasssubstrate 201 with the obtained conductive paste and by baking thecoated substrate.

[0302] The scanning electrode 202 also has an electrode portion sectionoutside of the displaying region.

[0303] The scanning electrode 202 is placed in such a manner that it isexposed in the discharging space 300 at least in the displaying regionand is fabricated by being coated with the white dielectric layer 203obtained by forming a dielectric paste containing glass with a lowmelting point made of white pigment fine particles using the screenprinting method and by baking the obtained dielectric paste.

[0304] On the white dielectric layer 203 is formed a three-waveformlight emitting fluorescent material by a screen printing method which isthen baked and is used as the fluorescent material layer 204.

[0305] Then, a frit glass paste is formed by being discharged in aclosed line form by a dispenser in a portion surrounding an outside ofthe displaying region of the first glass substrate 101 and the secondglass substrate 201 and the formed frit glass paste is pre-baked.

[0306] On the rear glass substrate 201 are formed a hole for introducinggas and an exhaust tube made up of a glass tube.

[0307] A backlight panel is fabricated by placing glass balls for aspacer each having a diameter of 0.1 mm to 2 mm between the first glasssubstrate 101 and the second glass substrate 201 and by performingpositioning on the glass balls, by baking and bonding them together.

[0308] In order to prevent movement of the glass spacer obtained by asealing process, it is desirous that a concave and convex portion havinga length of several to several tens•m in a portion in which the abovetransparent dielectric layer or the white dielectric layer 203 comesinto contact with the glass spacer.

[0309] Gas in the above stuck backlight is exhausted through an exhausttube until a vacuum is produced and, at the same time, the backlightpanel is heated so as to promptly exhaust the atmospheric gas being leftin the backlight panel.

[0310] After sufficient heating and exhausting, a temperature in thebacklight panel is lowered and Xe (xenon) gas is fed into thedischarging space 300 in the backlight panel at a pressure of 600 hPa ina hermetic manner and then the exhausting tube is closed.

[0311] As a discharging gas, besides the Xe (Xenon) gas, a pure gas ofAr (Argon), Kr (krypton), or N (nitrogen), or a mixed gas of inert gasesincluding He (Helium) or Ne (Neon) with these gases can be used. Gascomposition and a thickness of the dielectric material layer can becalibrated in such a manner that luminance of emitted light and drivingvoltage are optimized.

[0312] Next, a method of scanning and driving by the discharging-typebacklight employed in the embodiment is described.

[0313] As shown in FIG. 33, a voltage having a sine wave or arectangular wave of several kHz to several tens MHz is applied to thecommon electrode 102.

[0314] Also, as shown in FIG. 33, to the scanning electrode 202 whichdoes not emit light for discharging is applied a voltage being driftedfrom an intermediate voltage of an alternating voltage being applied tothe common electrode 102.

[0315] To the scanning electrode 202 that emits light for discharging isapplied a voltage being approximately an intermediate voltage of analternating voltage being applied to the common electrode 102.

[0316] In a region where a voltage of the scanning electrode 202, asurface on a side of the discharging space 300 of the dielectricmaterial layer existing between the common electrode 102 and thescanning electrode 202 is charged with electricity and discharging isterminated once. However, reverse-polarity discharging occurs by avoltage, being applied immediately, having a reverse polarity in thecommon electrode 102 and the discharging is maintained by repetition ofthese operations.

[0317] On the other hand, when a voltage of the scanning electrode 202is drifted largely from an intermediate voltage of the common electrode102, if discharging occurs by a large potential difference and isterminated by charging with electricity once, a potential difference issmall at a subsequent voltage having a reverse polarity and continuousdischarging can be avoided.

[0318] Moreover, by a voltage being applied to the scanning electrode202, luminance of emitted light can be changed.

[0319] By having a voltage to be applied to the scanning electrode 202be scanned for every single scanning line or every two or more scanningline blocks, light can be emitted while a scanning line to emit light isbeing selected.

[0320] Modulation of a voltage to be fed to the scanning electrode 202can be performed at a high speed by a switch fabricated by using, forexample, an FET (Field Effect Transistor).

[0321] Next, configurations and driving methods for more improvingcharacteristics of scanning light emission in the backlight for scanningof the present invention are described.

[0322] When such the scanning discharging as described above isperformed, in a region where the scanning discharging is initiatedwithout occurrence of discharging in a surrounding area, discharging isunstable.

[0323] As shown in FIG. 28, an auxiliary discharging region beingadjacent to a region in which scanning light emission starts and inwhich discharging is maintained continuously or immediately beforeinitiation of scanning light emission, is formed outside of thedisplaying region by the auxiliary discharging electrode 104.

[0324] These electrodes can be fabricated by using same processes asused for fabricating the common electrode 102 or the scanning electrode202. By the auxiliary discharging, an ion, electron or excited atoms ormolecules can be supplied to a region in which scanning light emissionis initiated and a state of initiation of the scanning discharging canbe stabilized.

[0325] Moreover, in the auxiliary discharging electrode 104, it ispreferable that the discharging light emission is inhibited by makingsmall an area of the auxiliary discharging electrode 104 and by makinglarge a thickness of its dielectric material layer in a range in whichdischarging is stable. To prevent light for auxiliary discharging fromleaking into the displaying region, a light intercepting section 105 isformed on a side of the displaying face in the auxiliary dischargingregion (see FIG. 28).

[0326] Also, in order to prevent light for the auxiliary dischargingfrom being converted to visible light, as shown in FIG. 29, no placementof the fluorescent material in a region in which auxiliary dischargingelectrodes 104 are arranged is an effective idea.

[0327] Furthermore, as shown in FIG. 30, formation of the (auxiliarydischarging intercepting) partition wall 106 used to separate theauxiliary discharging region from the scanning discharging region withina range in which an effect by the auxiliary discharging is reduced morethan necessary is also effective in preventing light for the auxiliarydischarging from being converted to visible light.

[0328] A voltage being applied to the auxiliary discharging region maybe same as in the scanning discharging region and an other drivingcircuit may be provided.

[0329] In the case of using the other driving circuit, although costsrequired for using the driving circuit has risen, intensity of auxiliarydischarging can be independently controlled and both a displayingfunction and a driving function can be easily optimized.

[0330] Next, in order to more improve characteristics of backlightscanning light emission, as shown in FIG. 31, a scanning electrode 202of the discharging-type backlight is placed outside the displayingregion of the liquid crystal displaying section 1 and by synchronizingscanning timing for the liquid crystal displaying section 1 withscanning timing for the backlight, scanning is performed approximatelyat a same speed.

[0331] In the discharging-type backlight, in some cases, light emissionat a discharging end is different in uniformity from the light emissionat a central portion or is dispersed in uniformity. By providingredundancy to a scanning light emission region of the backlight, highreliability can be given to a displaying characteristic of the liquidcrystal display panel performing a scanning driving using the backlight,that is, the scanning-type backlight.

[0332] It is clear that characteristics of light emission and scanningdriving become better by using the auxiliary discharging in combination.

[0333] Next, another example of the discharging-type backlight that canemit light providing three primary colors (R, G, and B) is described.

[0334] In the example, at least one of either the common electrode orthe scanning electrode corresponds to a region in which any one ofcolors out of the three primary colors RGB appears.

[0335] For example, the scanning electrode is formed on the rearsubstrate in a short-book form and a strip-shaped partition wall havinga height of 100•m to several millimeters is formed in a manner that aregion including the (short-book shaped) electrode is partitioned. On aninside wall face of this partition wall is formed a white dielectriclayer and are stacked RGB color changing fluorescent material layers inorder.

[0336] After the white dielectric material layer has been formed in amanner that it covers an entire discharging displaying region of theshort-book shaped scanning electrode, the strip-shaped partition walland the RGB color changing fluorescent material layers may be formed. ARGB color scanning-type backlight is fabricated by manufacturing thefront substrate having the common electrode in the way described aboveand by bonding the front substrate to the rear substrate.

[0337] A rectangular waveform voltage or sine waveform voltage havingseveral kHz to several tens MHz are applied to the common electrode anda voltage is applied to the scanning electrode in a manner that lightemission occurs in a region for each of RGB colors and scanning isperformed.

[0338] A state in which the RGB color light emission region isdiscontinuous can be controlled by an expanding plate and scanning canbe performed individually on the uniform RGB color light emissionregion. By operating as above, a liquid crystal panel having a highaperture rate and a high light using rate can be obtained without usinga color filter. Since the high light using rate can be obtained, it ispossible to improve luminance of emitted light and to reduce powerconsumption.

[0339] In the above example, the discharging-type backlight operated byusing discharge in a gas is explained, however, as the backlight, forexample, a field-emission-type backlight in which electrons areaccelerated in a vacuum and the accelerated electrons is injected into afluorescent material or an organic electroluminescence-type backlightoperated by using electroluminescent light may be employed.

[0340] It is apparent that the present invention is not limited to theabove embodiments but may be changed and modified without departing fromthe scope and spirit of the invention.

What is claimed is:
 1. A liquid crystal display device comprising: aliquid crystal display section; a backlight section used to feedilluminating light to said liquid crystal display section, wherein saidbacklight section comprises a backlight face, a scanning electrodeportion of which is made up of a plurality of scanning electrode groupseach having a plurality of scanning electrodes, a plurality of lightemitting layer groups, each of which is made up of a plurality of lightemitting layers each having a different luminescent color, and beingspatially separated from each other on said backlight face; and ascanning drive circuit to scan every the emitting layer group, as ascanning unit.
 2. The liquid crystal display device according to claim1, further comprising a controller to have a scanning phase in saidbacklight section lag behind a scanning phase in said liquid crystaldisplaying section.
 3. The liquid crystal display device according toclaim 1, wherein, in said liquid crystal display section, illuminatinglight for displaying is applied from said backlight section to a pixelexisting in a vicinity of a selected scanning line and illuminatinglight for displaying is not applied from said backlight section to apixel in a non-selected scanning line.
 4. The liquid crystal displaydevice according to claim 3, wherein said liquid crystal display sectionis driven in a simple matrix manner.
 5. The liquid crystal displaydevice according to claim 1, further comprising a luminance changingcircuit to change light emitting time in a region where light is beingfed in a scanning direction in said backlight thus to change maximumluminance of light in said region being scanned.
 6. The liquid crystaldisplay device according to claim 1, being provided with a lightdiffusing layer between said liquid crystal display section and saidbacklight section to diffuse light fed from said backlight section in aplane direction inside said light diffusing layer.
 7. The liquid crystaldisplay device according to claim 1, wherein light fed from saidbacklight section is generated by discharge in a gas.
 8. The liquidcrystal display device according to claim 1, wherein a gas is filled insaid backlight section in a hermetic manner and wherein light fed fromsaid backlight section is fluorescent light emitted from a fluorescentmaterial excited by excitation light generated by discharge in said gas.9. The liquid crystal display device according to claim 1, wherein afluorescent layer is mounted on a front face of said liquid crystaldisplay section and wherein light fed from said backlight section, afterhaving passed through said liquid crystal display section, enters intosaid fluorescent layer.
 10. The liquid crystal display device accordingto claim 1, wherein said backlight section is maintained under vacuumand has a scanning electrode used to scan an electron source and anelectron fed from said electron source is guided into a fluorescentlayer and wherein light fed from said backlight section is produced byaccelerating electrons under said vacuum and injecting the acceleratedelectrons into said fluorescent layer.
 11. The liquid crystal displaydevice according to claim 1, wherein said backlight section is providedwith an electroluminescent device and light fed from said backlightsection is electroluminescent light.
 12. The liquid crystal displaydevice according to claim 1, wherein scanning on a screen of said liquidcrystal display section and of said backlight section is performed in asame period.
 13. The liquid crystal display device according to claim 1,wherein a screen scanning period in said liquid crystal display sectionis equal to a screen scanning period in said backlight section andwherein screen scanning in said liquid crystal display section isperformed once during a period when screen scanning in said backlightsection is performed two or more times.
 14. A liquid crystal displaydevice comprising: a liquid crystal display section; a backlight sectionused to feed illuminating light to said liquid crystal display section,wherein said backlight section comprises a backlight face, a pluralityof scanning electrodes, a plurality of light emitting layers each havinga different luminescent color, and being spatially separated from eachother on said backlight face; and a tone changing circuit to changelight emitting time of each of said luminescent colors in a scanningdirection in said backlight and thus to change a color tone in a regionbeing scanned.
 15. The liquid crystal display device according to claim14, further comprising a controller to have a scanning phase in saidbacklight section lag behind a scanning phase in said liquid crystaldisplaying section.
 16. The liquid crystal display device according toclaim 4, wherein, in said liquid crystal display section, illuminatinglight for displaying is applied from said backlight section to a pixelexisting in a vicinity of a selected scanning line and illuminatinglight for displaying is not applied from said backlight section to apixel in a non-selected scanning line.
 17. The liquid crystal displaydevice according to claim 16, wherein said liquid crystal displaysection is driven in a simple matrix manner.
 18. The liquid crystaldisplay device according to claim 14, further comprising a luminancechanging circuit to change light emitting time in a region where lightis being fed in a scanning direction in said backlight thus to changemaximum luminance of light in said region being scanned.
 19. The liquidcrystal display device according to claim 14, being provided with alight diffusing layer between said liquid crystal display section andsaid backlight section to diffuse light fed from said backlight sectionin a plane direction inside said light diffusing layer.
 20. The liquidcrystal display device according to claim 14, wherein light fed fromsaid backlight section is generated by discharge in a gas.
 21. Theliquid crystal display device according to claim 14, wherein a gas isfilled in said backlight section in a hermetic manner and wherein lightfed from said backlight section is fluorescent light emitted from afluorescent material excited by excitation light generated by dischargein said gas.
 22. The liquid crystal display device according to claim14, wherein a fluorescent layer is mounted on a front face of saidliquid crystal display section and wherein light fed from said backlightsection, after having passed through said liquid crystal displaysection, enters into said fluorescent layer.
 23. The liquid crystaldisplay device according to claim 14, wherein said backlight section ismaintained under vacuum and has a scanning electrode used to scan anelectron source and an electron fed from said electron source is guidedinto a fluorescent layer and wherein light fed from said backlightsection is produced by accelerating electrons under said vacuum andinjecting the accelerated electrons into said fluorescent layer.
 24. Theliquid crystal display device according to claim 14, wherein saidbacklight section is provided with an electroluminescent device andlight fed from said backlight section is electroluminescent light. 25.The liquid crystal display device according to claim 14, whereinscanning on a screen of said liquid crystal display section and of saidbacklight section is performed in a same period.
 26. The liquid crystaldisplay device according to claim 14, wherein a screen scanning periodin said liquid crystal display section is equal to a screen scanningperiod in said backlight section and wherein screen scanning in saidliquid crystal display section is performed once during a period whenscreen scanning in said backlight section is performed two or moretimes.
 27. A liquid crystal display device comprising: a liquid crystaldisplay section; a backlight section used to feed illuminating light tosaid liquid crystal display section wherein a width of screen scanningin said backlight section is larger than a width of screen scanning insaid liquid crystal display section.
 28. The liquid crystal displaydevice according to claim 27, wherein said width of screen scanning insaid backlight section is an integral multiple of said width of screenscanning in said liquid crystal display section.
 29. The liquid crystaldisplay device according to claim 27, further comprising a controller tohave a scanning phase in said backlight section lag behind a scanningphase in said liquid crystal displaying section.
 30. The liquid crystaldisplay device according to claim 27, wherein, in said liquid crystaldisplay section, illuminating light for displaying is applied from saidbacklight section to a pixel existing in a vicinity of a selectedscanning line and illuminating light for displaying is not applied fromsaid backlight section to a pixel in a non-selected scanning line. 31.The liquid crystal display device according to claim 30, wherein saidliquid crystal display section is driven in a simple matrix manner. 32.The liquid crystal display device according to claim 27, furthercomprising a luminance changing circuit to change light emitting time ina region where light is being fed in a scanning direction in saidbacklight thus to change maximum luminance of light in said region beingscanned.
 33. The liquid crystal display device according to claim 27,being provided with a light diffusing layer between said liquid crystaldisplay section and said backlight section to diffuse light fed fromsaid backlight section in a plane direction inside said light diffusinglayer.
 34. The liquid crystal display device according to claim 27,wherein light fed from said backlight section is generated by dischargein a gas.
 35. The liquid crystal display device according to claim 27,wherein a gas is filled in said backlight section in a hermetic mannerand wherein light fed from said backlight section is fluorescent lightemitted from a fluorescent material excited by excitation lightgenerated by discharge in said gas.
 36. The liquid crystal displaydevice according to claim 27, wherein a fluorescent layer is mounted ona front face of said liquid crystal display section and wherein lightfed from said backlight section, after having passed through said liquidcrystal display section, enters into said fluorescent layer.
 37. Theliquid crystal display device according to claim 27, wherein saidbacklight section is maintained under vacuum and has a scanningelectrode used to scan an electron source and an electron fed from saidelectron source is guided into a fluorescent layer and wherein light fedfrom said backlight section is produced by accelerating electrons undersaid vacuum and injecting the accelerated electrons into saidfluorescent layer.
 38. The liquid crystal display device according toclaim 27, wherein said backlight section is provided with anelectroluminescent device and light fed from said backlight section iselectroluminescent light.
 39. The liquid crystal display deviceaccording to claim 27, wherein said backlight section comprises abacklight face, a plurality of light emitting layers each having aluminescent color, and being spatially separated from each other on saidbacklight face, and in scanning of said backlight section, each of saidluminescent colors is independently is scanned, and wherein timing ofscanning on a screen of said liquid crystal display section issynchronized with timing of scanning on a screen of said backlightsection.
 40. The liquid crystal display device according to claim 27,wherein said backlight section comprises a backlight face, a pluralityof light emitting layer groups, each of which is made up of a pluralityof light emitting layers each having a different luminescent color, andbeing spatially separated from each other on said backlight face, and inscanning of said backlight section, each of said light emitting layergroups is scanned as a scanning unit, and wherein timing of scanning ona screen of said liquid crystal display section is synchronized withtiming of scanning on a screen of said backlight section.
 41. The liquidcrystal display device according to claim 27, wherein scanning on ascreen of said liquid crystal display section and of said backlightsection is performed in a same period.
 42. The liquid crystal displaydevice according to claim 27, wherein a screen scanning period in saidliquid crystal display section is equal to a screen scanning period insaid backlight section and wherein screen scanning in said liquidcrystal display section is performed once during a period when screenscanning in said backlight section is performed two or more times.
 43. Aliquid crystal display device comprising: a liquid crystal displaysection; a backlight section used to feed illuminating light to saidliquid crystal display section wherein said backlight section has aplurality of scanning electrodes; and a phase-delay circuit to have ascanning phase in said backlight section lag behind a scanning phase insaid liquid crystal display section, wherein light fed from saidbacklight section is fed after a response by said liquid crystal displaysection.
 44. The liquid crystal display device according to claim 43,wherein, in said liquid crystal display section, illuminating light fordisplaying is applied from said backlight section to a pixel existing ina vicinity of a selected scanning line and illuminating light fordisplaying is not applied from said backlight section to a pixel in anon-selected scanning line.
 45. The liquid crystal display deviceaccording to claim 44, wherein said liquid crystal display section isdriven in a simple matrix manner.
 46. The liquid crystal display deviceaccording to claim 43, further comprising a luminance changing circuitto change light emitting time in a region where light is being fed in ascanning direction in said backlight thus to change maximum luminance oflight in said region being scanned.
 47. The liquid crystal displaydevice according to claim 43, being provided with a light diffusinglayer between said liquid crystal display section and said backlightsection to diffuse light fed from said backlight section in a planedirection inside said light diffusing layer.
 48. The liquid crystaldisplay device according to claim 43, wherein light fed from saidbacklight section is generated by discharge in a gas.
 49. The liquidcrystal display device according to claim 43, wherein a gas is filled insaid backlight section in a hermetic manner and wherein light fed fromsaid backlight section is fluorescent light emitted from a fluorescentmaterial excited by excitation light generated by discharge in said gas.50. The liquid crystal display device according to claim 43, wherein afluorescent layer is mounted on a front face of said liquid crystaldisplay section and wherein light fed from said backlight section, afterhaving passed through said liquid crystal display section, enters intosaid fluorescent layer.
 51. The liquid crystal display device accordingto claim 43, wherein said backlight section is maintained under vacuumand has a scanning electrode used to scan an electron source and anelectron fed from said electron source is guided into a fluorescentlayer and wherein light fed from said backlight section is produced byaccelerating electrons under said vacuum and injecting the acceleratedelectrons into said fluorescent layer.
 52. The liquid crystal displaydevice according to claim 43, wherein said backlight section is providedwith an electroluminescent device and light fed from said backlightsection is electroluminescent light.
 53. The liquid crystal displaydevice according to claim 43, wherein said backlight section comprises abacklight face, a plurality of light emitting layers each having aluminescent color, and being spatially separated from each other on saidbacklight face, and in scanning of said backlight section, each of saidluminescent colors is independently is scanned, and wherein timing ofscanning on a screen of said liquid crystal display section issynchronized with timing of scanning on a screen of said backlightsection.
 54. The liquid crystal display device according to claim 43,wherein said backlight section comprises a backlight face, a pluralityof light emitting layer groups, each of which is made up of a pluralityof light emitting layers each having a different luminescent color, andbeing spatially separated from each other on said backlight face, and inscanning of said backlight section, each of said light emitting layergroups is scanned as a scanning unit, and wherein timing of scanning ona screen of said liquid crystal display section is synchronized withtiming of scanning on a screen of said backlight section.
 55. The liquidcrystal display device according to claim 43, wherein scanning on ascreen of said liquid crystal display section and of said backlightsection is performed in a same period.
 56. The liquid crystal displaydevice according to claim 43, wherein a screen scanning period in saidliquid crystal display section is equal to a screen scanning period insaid backlight section and wherein screen scanning in said liquidcrystal display section is performed once during a period when screenscanning in said backlight section is performed two or more times.
 57. Aliquid crystal display device comprising: a liquid crystal displaysection; a backlight section used to feed illuminating light to saidliquid crystal display device; and a prism layer made up of a singlelayer or a plurality of layers used to change light fed from saidbacklight section into light having directivity, being mounted betweensaid liquid crystal display section and said backlight section.
 58. Theliquid crystal display device according to claim 57, further comprisingsaid backlight section, said prism layer, a light diffusing layer usedto diffuse light fed through said prism layer from said backlightsection in a plane direction inside said light diffusing layer and saidliquid crystal display section, which are stacked in layers in thisorder.
 59. The liquid crystal display device according to claim 57,wherein light fed from said backlight section is generated by dischargein a gas.
 60. The liquid crystal display device according to claim 57,wherein a gas is filled in said backlight section in a hermetic mannerand wherein light fed from said backlight section is fluorescent lightemitted from a fluorescent material excited by excitation lightgenerated by discharge in said gas.
 61. The liquid crystal displaydevice according to claim 57, wherein a fluorescent layer is mounted ona front face of said liquid crystal display section and wherein lightfed from said backlight section, after having passed through said liquidcrystal display section, enters into said fluorescent layer.
 62. Theliquid crystal display device according to claim 57, wherein saidbacklight section is maintained under vacuum and has a scanningelectrode used to scan an electron source and an electron fed from saidelectron source is guided into a fluorescent layer and wherein light fedfrom said backlight section is produced by accelerating electrons undersaid vacuum and injecting the accelerated electrons into saidfluorescent layer.
 63. The liquid crystal display device according toclaim 57, wherein said backlight section is provided with anelectroluminescent device and light fed from said backlight section iselectroluminescent light.
 64. The liquid crystal display deviceaccording to claim 57, wherein said backlight section comprises abacklight face, a plurality of light emitting layers each having aluminescent color, and being spatially separated from each other on saidbacklight face, and in scanning of said backlight section, each of saidluminescent colors is independently is scanned, and wherein timing ofscanning on a screen of said liquid crystal display section issynchronized with timing of scanning on a screen of said backlightsection.
 65. The liquid crystal display device according to claim 57,wherein said backlight section comprises a backlight face, a pluralityof light emitting layer groups, each of which is made up of a pluralityof light emitting layers each having a different luminescent color, andbeing spatially separated from each other on said backlight face, and inscanning of said backlight section, each of said light emitting layergroups is scanned as a scanning unit, and wherein timing of scanning ona screen of said liquid crystal display section is synchronized withtiming of scanning on a screen of said backlight section.
 66. The liquidcrystal display device according to claim 57, wherein scanning on ascreen of said liquid crystal display section and of said backlightsection is performed in a same period.
 67. The liquid crystal displaydevice according to claim 57, wherein a screen scanning period in saidliquid crystal display section is equal to a screen scanning period insaid backlight section and wherein screen scanning in said liquidcrystal display section is performed once during a period when screenscanning in said backlight section is performed two or more times.
 68. Aliquid crystal display device comprising: a liquid crystal displaysection; a backlight section used to feed illuminating light to saidliquid crystal display section; and an anti-EMI (Electro-MagneticInterference) filter layer being mounted between said liquid crystaldisplay section and said backlight section.
 69. The liquid crystaldisplay device according to claim 68, wherein said anti-EMI filter layeris mounted internally in said liquid crystal displaying section.
 70. Theliquid crystal display device according to claim 68, wherein light fedfrom said backlight section is generated by discharge in a gas.
 71. Theliquid crystal display device according to claim 68, wherein a gas isfilled in said backlight section in a hermetic manner and wherein lightfed from said backlight section is fluorescent light emitted from afluorescent material excited by excitation light generated by dischargein said gas.
 72. The liquid crystal display device according to claim68, wherein a fluorescent layer is mounted on a front face of saidliquid crystal display section and wherein light fed from said backlightsection, after having passed through said liquid crystal displaysection, enters into said fluorescent layer.
 73. The liquid crystaldisplay device according to claim 68, wherein said backlight section ismaintained under vacuum and has a scanning electrode used to scan anelectron source and an electron fed from said electron source is guidedinto a fluorescent layer and wherein light fed from said backlightsection is produced by accelerating electrons under said vacuum andinjecting the accelerated electrons into said fluorescent layer.
 74. Theliquid crystal display device according to claim 68, wherein saidbacklight section is provided with an electroluminescent device andlight fed from said backlight section is electroluminescent light. 75.The liquid crystal display device according to claim 68, wherein saidbacklight section comprises a backlight face, a plurality of lightemitting layers each having a luminescent color, and being spatiallyseparated from each other on said backlight face, and in scanning ofsaid backlight section, each of said luminescent colors is independentlyis scanned, and wherein timing of scanning on a screen of said liquidcrystal display section is synchronized with timing of scanning on ascreen of said backlight section.
 76. The liquid crystal display deviceaccording to claim 68, wherein said backlight section comprises abacklight face, a plurality of light emitting layer groups, each ofwhich is made up of a plurality of light emitting layers each having adifferent luminescent color, and being spatially separated from eachother on said backlight face, and in scanning of said backlight section,each of said light emitting layer groups is scanned as a scanning unit,and wherein timing of scanning on a screen of said liquid crystaldisplay section is synchronized with timing of scanning on a screen ofsaid backlight section.
 77. The liquid crystal display device accordingto claim 68, wherein scanning on a screen of said liquid crystal displaysection and of said backlight section is performed in a same period. 78.The liquid crystal display device according to claim 68, wherein ascreen scanning period in said liquid crystal display section is equalto a screen scanning period in said backlight section and wherein screenscanning in said liquid crystal display section is performed once duringa period when screen scanning in said backlight section is performed twoor more times.
 79. A liquid crystal display device comprising: a liquidcrystal display section; a backlight section used to feed illuminatinglight to said liquid crystal display section; and wherein said backlightsection, an anti-EMI (Electro-Magnetic Interference) filter layer, alight diffusing layer used to diffuse light fed through said anti-EMIfilter layer from said backlight in a plane direction inside said lightdiffusing layer, and said liquid crystal display section are arranged inthis order.
 80. The liquid crystal display device according to claim 79,wherein light fed from said backlight section is generated by dischargein a gas.
 81. The liquid crystal display device according to claim 79,wherein a gas is filled in said backlight section in a hermetic mannerand wherein light fed from said backlight section is fluorescent lightemitted from a fluorescent material excited by excitation lightgenerated by discharge in said gas.
 82. The liquid crystal displaydevice according to claim 79, wherein a fluorescent layer is mounted ona front face of said liquid crystal display section and wherein lightfed from said backlight section, after having passed through said liquidcrystal display section, enters into said fluorescent layer.
 83. Theliquid crystal display device according to claim 79, wherein saidbacklight section is maintained under vacuum and has a scanningelectrode used to scan an electron source and an electron fed from saidelectron source is guided into a fluorescent layer and wherein light fedfrom said backlight section is produced by accelerating electrons undersaid vacuum and injecting the accelerated electrons into saidfluorescent layer.
 84. The liquid crystal display device according toclaim 79, wherein said backlight section is provided with anelectroluminescent device and light fed from said backlight section iselectroluminescent light.
 85. The liquid crystal display deviceaccording to claim 79, wherein said backlight section comprises abacklight face, a plurality of light emitting layers each having aluminescent color, and being spatially separated from each other on saidbacklight face, and in scanning of said backlight section, each of saidluminescent colors is independently is scanned, and wherein timing ofscanning on a screen of said liquid crystal display section issynchronized with timing of scanning on a screen of said backlightsection.
 86. The liquid crystal display device according to claim 79,wherein said backlight section comprises a backlight face, a pluralityof light emitting layer groups, each of which is made up of a pluralityof light emitting layers each having a different luminescent color, andbeing spatially separated from each other on said backlight face, and inscanning of said backlight section, each of said light emitting layergroups is scanned as a scanning unit, and wherein timing of scanning ona screen of said liquid crystal display section is synchronized withtiming of scanning on a screen of said backlight section.
 87. The liquidcrystal display device according to claim 79, wherein scanning on ascreen of said liquid crystal display section and of said backlightsection is performed in a same period.
 88. The liquid crystal displaydevice according to claim 79, wherein a screen scanning period in saidliquid crystal display section is equal to a screen scanning period insaid backlight section and wherein screen scanning in said liquidcrystal display section is performed once during a period when screenscanning in said backlight section is performed two or more times.
 89. Aliquid crystal display device comprising:, a liquid crystal displaysection; a backlight section used to feed illuminating light to saidliquid crystal display section; and either of an infrared ray absorbinglayer to absorb infrared rays or an infrared ray reflecting filter layerto reflect infrared rays, being mounted between said liquid crystaldisplay section and said backlight section.
 90. The liquid crystaldisplay device according to claim 89, wherein light fed from saidbacklight section is generated by discharge in a gas.
 91. The liquidcrystal display device according to claim 89, wherein a gas is filled insaid backlight section in a hermetic manner and wherein light fed fromsaid backlight section is fluorescent light emitted from a fluorescentmaterial excited by excitation light generated by discharge in said gas.92. The liquid crystal display device according to claim 89, wherein afluorescent layer is mounted on a front face of said liquid crystaldisplay section and wherein light fed from said backlight section, afterhaving passed through said liquid crystal display section, enters intosaid fluorescent layer.
 93. The liquid crystal display device accordingto claim 89, wherein said backlight section is maintained under vacuumand has a scanning electrode used to scan an electron source and anelectron fed from said electron source is guided into a fluorescentlayer and wherein light fed from said backlight section is produced byaccelerating electrons under said vacuum and injecting the acceleratedelectrons into said fluorescent layer.
 94. The liquid crystal displaydevice according to claim 89, wherein said backlight section is providedwith an electroluminescent device and light fed from said backlightsection is electroluminescent light.
 95. The liquid crystal displaydevice according to claim 89, wherein said backlight section comprises abacklight face, a plurality of light emitting layers each having aluminescent color, and being spatially separated from each other on saidbacklight face, and in scanning of said backlight section, each of saidluminescent colors is independently is scanned, and wherein timing ofscanning on a screen of said liquid crystal display section issynchronized with timing of scanning on a screen of said backlightsection.
 96. The liquid crystal display device according to claim 89,wherein said backlight section comprises a backlight face, a pluralityof light emitting layer groups, each of which is made up of a pluralityof light emitting layers each having a different luminescent color, andbeing spatially separated from each other on said backlight face, and inscanning of said backlight section, each of said light emitting layergroups is scanned as a scanning unit, and wherein timing of scanning ona screen of said liquid crystal display section is synchronized withtiming of scanning on a screen of said backlight section.
 97. The liquidcrystal display device according to claim 89, wherein scanning on ascreen of said liquid crystal display section and of said backlightsection is performed in a same period.
 98. The liquid crystal displaydevice according to claim 89, wherein a screen scanning period in saidliquid crystal display section is equal to a screen scanning period insaid backlight section and wherein screen scanning in said liquidcrystal display section is performed once during a period when screenscanning in said backlight section is performed two or more times.
 99. Aliquid crystal display device having four sides comprising: a liquidcrystal display section provided with a plurality of scanning lines anda plurality of signal lines; a backlight section used to feedilluminating light to said liquid crystal display section and beingprovided with a plurality of scanning electrodes; wherein a side atwhich there is placed a terminal portion of each of said plurality ofscanning lines and said plurality of said signal lines in said liquidcrystal display section are different from a side at which there placeda terminal portion of said plurality of said scanning electrodes in saidbacklight section.
 100. The liquid crystal display device according toclaim 99, wherein light fed from said backlight section is generated bydischarge in a gas.
 101. The liquid crystal display device according toclaim 99, wherein a gas is filled in said backlight section in ahermetic manner and wherein light fed from said backlight section isfluorescent light emitted from a fluorescent material excited byexcitation light generated by discharge in said gas.
 102. The liquidcrystal display device according to claim 99, wherein a fluorescentlayer is mounted on a front face of said liquid crystal display sectionand wherein light fed from said backlight section, after having passedthrough said liquid crystal display section, enters into saidfluorescent layer.
 107. The liquid crystal display device according toclaim 99, wherein said backlight section is maintained under vacuum andhas a scanning electrode used to scan an electron source and an electronfed from said electron source is guided into a fluorescent layer andwherein light fed from said backlight section is produced byaccelerating electrons under said vacuum and injecting the acceleratedelectrons into said fluorescent layer.
 104. The liquid crystal displaydevice according to claim 99, wherein said backlight section is providedwith an electroluminescent device and light fed from said backlightsection is electroluminescent light.
 105. The liquid crystal displaydevice according to claim 99, wherein said backlight section comprises abacklight face, a plurality of light emitting layers each having aluminescent color, and being spatially separated from each other on saidbacklight face, and in scanning of said backlight section, each of saidluminescent colors is independently is scanned, and wherein timing ofscanning on a screen of said liquid crystal display section issynchronized with timing of scanning on a screen of said backlightsection.
 106. The liquid crystal display device according to claim 99,wherein said backlight section comprises a backlight face, a pluralityof light emitting layer groups, each of which is made up of a pluralityof light emitting layers each having a different luminescent color, andbeing spatially separated from each other on said backlight face, and inscanning of said backlight section, each of said light emitting layergroups is scanned as a scanning unit, and wherein timing of scanning ona screen of said liquid crystal display section is synchronized withtiming of scanning on a screen of said backlight section.
 107. Theliquid crystal display device according to claim 99, wherein scanning ona screen of said liquid crystal display section and of said backlightsection is performed in a same period.
 108. The liquid crystal displaydevice according to claim 99, wherein a screen scanning period in saidliquid crystal display section is equal to a screen scanning period insaid backlight section and wherein screen scanning in said liquidcrystal display section is performed once during a period when screenscanning in said backlight section is performed two or more times. 109.A plane-type backlight comprising: a first substrate and a secondsubstrate being mounted apart from each other wherein gas is fed intospace existing between said first substrate and said second substrateand a portion surrounding said space is sealed in a hermetic manner; acommon electrode being mounted on said first substrate; a plurality ofscanning electrodes being mounted on said second substrate; and whereina voltage is applied between said common electrode and each of saidscanning electrodes to cause discharging to occur in said space betweensaid first substrate and said second substrate and wherein light isemitted by exciting a fluorescent material being arranged between saidfirst substrate and said second substrate; and wherein said commonelectrode is made up of electrodes formed so as to be at a samepotential on an entire light emitting face; and a selecting circuit usedto sequentially select one scanning electrode out of said plurality ofscanning electrodes.
 110. The plane-type backlight according to claim109, wherein said common electrode and said plurality of said scanningelectrode are respectively made up of a plurality of belt-shapedelectrodes being extended in a same direction and each of saidbelt-shaped electrodes corresponds to each luminescent color having oneof RGB (red, green, and blue) colors.
 111. The plane-type backlightaccording to claim 109, wherein said common electrode and said pluralityof said scanning electrode are made up of belt-shaped electrodesintersecting at right angles to each other and each of said belt-shapedelectrodes corresponds to each luminescent color having one color out ofsaid RGB colors.
 112. The plane-type backlight according to claim 109,wherein at least one of said common electrode and said plurality of saidscanning electrode is made up of a plurality of belt-shaped electrodesand a control electrode used to inhibit expansion of light emission ismounted between two said belt-shaped electrodes adjacent to each other.113. A plane-type backlight comprising: a first substrate and a secondsubstrate being mounted apart from each other wherein gas is fed intospace existing between said first substrate and a second substrate and aportion surrounding said space is sealed in a hermetic manner; a commonelectrode being mounted on said first substrate; a plurality of scanningelectrodes being mounted on said second substrate; and wherein a voltageis applied between said common electrode and each of said scanningelectrodes to cause discharging to occur in said space existing betweensaid first substrate and said second substrate and wherein light isemitted by exciting a fluorescent material being arranged between saidfirst substrate and said second substrates and wherein said commonelectrodes and said plurality of scanning electrodes are made up of aplurality of belt-shaped electrodes being extended in a same direction;and a selecting circuit used to sequentially select one scanningelectrode out of said plurality of scanning electrodes.
 114. Theplane-type backlight according to claim 113, wherein said commonelectrode and the corresponding scanning electrode both being made up ofsaid belt-shaped electrodes are configured to deviate positionally fromeach other by a half period.
 115. The plane-type backlight according toclaim 113, wherein at least one of said common electrode and saidplurality of said scanning electrode is made up of a plurality ofbelt-shaped electrodes and a control electrode used to inhibit expansionof light emission is mounted between two said belt-shaped electrodesadjacent to each other.
 116. A plane-type backlight comprising: a firstsubstrate and a second substrate being mounted apart from each otherwherein gas is fed into space existing between said first substrate andsaid second substrate and a portion surrounding said space is sealed ina hermetic manner; a common electrode being mounted on said firstsubstrate; a plurality of scanning electrodes being mounted on saidsecond substrate; wherein a voltage is applied between said commonelectrode and each of said scanning electrode to cause discharging tooccur in said space existing between said first substrate and saidsecond substrate and wherein light is emitted by exciting a fluorescentmaterial being arranged between said first substrate and said secondsubstrate; and a protrusion being protruded toward a side of adischarging space existing between electrodes facing each other on atleast one of said common electrode and said plurality of said scanningelectrode.
 117. The plane-type backlight according to claim 116, whereinsaid protrusion is placed on a dielectric layer used to electricallyinsulate said discharging space from said electrode.
 118. The plane-typebacklight according to claim 116, wherein said protrusion is placed onan electrode being exposed in said discharging space.
 119. Theplane-type backlight according to claim 116, wherein at least one ofsaid common electrode and said plurality of said scanning electrode ismade up of a plurality of belt-shaped electrodes and a control electrodeused to inhibit expansion of light emission is mounted between two saidbelt-shaped electrodes adjacent to each other.
 120. A plane-typebacklight comprising: a first substrate and a second substrate beingmounted apart from each other wherein gas is fed into space existingbetween said first substrate and said second substrate and a portionsurrounding said space is sealed in a hermetic manner; a commonelectrode and a plurality of scanning electrodes being mounted on saidfirst substrate; wherein a voltage is applied between said commonelectrode and each of said scanning electrode to cause discharging tooccur in said space existing between said first substrate and saidsecond substrate and wherein light is emitted by exciting a fluorescentmaterial being arranged between said first substrate and said secondsubstrate and a selecting circuit used to sequentially select onescanning electrodes out of said plurality of scanning electrodes. 121.The plane-type backlight according to claim 120, wherein, on said firstsubstrate, said common electrode and said plurality of said scanningelectrodes are formed in a same face and said belt-shaped scanningelectrode is arranged between common electrodes a plane of which is of acomb-teeth shape.
 122. The plane-type backlight according to claim 120,wherein said common electrode and said plurality of said scanningelectrode are stacked in layer with an insulating film interposedbetween said common electrode and said plurality of said scanningelectrode on a side of said first substrate and wherein an opening isprovided on said electrode mounted on a first layer out of saidelectrodes being stacked in two layers.
 123. A discharging-typebacklight for a liquid crystal display device comprising: an auxiliarydischarging region existing adjacent to an outside of a light emittingregion for displaying in a light emitting region for discharging inwhich scanning lines being adjacent to each other to initiate lightemitting for scanning do not emit light, which causes discharging tooccur immediately before initiation of at least light emitting forscanning.
 124. The discharging-type backlight according to claim 123,wherein said auxiliary discharging region keeps discharging continuouslyduring light emission for scanning and discharging.
 125. Thedischarging-type backlight according to claim 123, wherein an area of anauxiliary discharging electrode used to have discharging occur in saidauxiliary discharging region is smaller than that of an electrode usedto emit light for scanning and discharging.
 126. The discharging-typebacklight according to claim 123, wherein a thickness of a dielectriclayer covering said auxiliary discharging electrode is greater than thatof a dielectric layer covering an electrode used to emit light forscanning and discharging.
 127. The discharging-type backlight accordingto claim 123, wherein a portion surrounding said auxiliary dischargingregion is a region of a fluorescent material layer.
 128. Thedischarging-type backlight according to claim 123, wherein a partitionwall is placed outside of a light emitting region for discharging inwhich scanning is initiated and invasion of light for discharging in aregion in which discharging is kept continuously into a light emittingregion for scanning is reduced.
 129. The discharging-type backlightaccording to claim 123, wherein a region in which light emission forscanning is initiated is placed outside of a displaying region.
 130. Thedischarging-type backlight according to claim 123, wherein an electrodefor discharging to initiate light emission for scanning is placedoutside of said displaying region.
 131. A method for driving a planedischarging-type backlight which comprises a first glass substrate and asecond glass substrate, a first electrode formed on said first glasssubstrate, a second electrode formed on said second glass substrate, atleast one of which is covered with a dielectric layer, wherein gas isfed into space formed between said first glass substrate and secondglass substrate and a portion surrounding said space is sealed in ahermetic manner and wherein a voltage is applied between said first andsaid second electrode to have discharging occur in a space between saidfirst and said second glass substrate and light is emitted by exciting afluorescent material being placed between said first glass and saidsecond glass substrate, said method comprising: a step of constructingat least one of said first and second electrodes to have dischargingoccur of a plurality of belt-shaped electrodes; and a step of applying aDC (direct current) voltage to one belt-shaped electrode out of saidplurality of belt-shaped electrodes during light emission for scanningand discharging in a region in which said belt-shaped electrode emitslight for discharging and of applying a sine waveform voltage or arectangular waveform voltage to an other electrode opposed to saidbelt-shaped electrode.
 132. The method for driving the planedischarging-type backlight according to claim 131, wherein scanning isperformed on light emitting region for discharging by scanning a DCvoltage to be applied to said belt-shaped electrode.
 133. The method fordriving the plane discharging-type backlight according to claim 131,wherein intensity of light emitted for scanning and discharging isvaried by changing a DC voltage value to be applied to said belt-shapedelectrode.
 134. The method for driving the plane discharging-typebacklight according to claim 131, wherein a width of a region of lightemission for scanning is varied by changing a number of belt-shapedelectrodes to which said DC voltage is applied.
 135. The method fordriving the plane discharging-type backlight according to claim 131,wherein luminance of light fed from the backlight is varied by changinga frequency of an AC (alternating current) voltage to be applied to saidanother electrode.
 136. A liquid crystal display device comprising: aliquid crystal display section; and a backlight comprising: a firstsubstrate and a second substrate being mounted apart from each otherwherein gas is fed into space existing between said first substrate andsaid second substrate and a portion surrounding said space is sealed ina hermetic manner; a common electrode being mounted on said firstsubstrate; and a plurality of scanning electrodes being mounted on saidsecond substrate; wherein a voltage is applied between said commonelectrode and each of said scanning electrodes to cause discharging tooccur in said space between said first substrate and said secondsubstrate and wherein light is emitted by exciting a fluorescentmaterial being arranged between said first substrate and said secondsubstrate; and wherein said common electrode is made up of electrodesformed so as to be at a same potential on an entire light emitting face;and a selecting circuit used to sequentially select one scanningelectrode out of said plurality of scanning electrodes; wherein scanningon said backlight and scanning on said liquid crystal display sectionare performed in a same period.
 137. A liquid crystal display devicecomprising: a liquid crystal display section; and a backlightcomprising: a first substrate and a second substrate being mounted apartfrom each other wherein gas is fed into space existing between saidfirst substrate and a second substrate and a portion surrounding saidspace is sealed in a hermetic manner; a common electrode being mountedon said first substrate; a plurality of scanning electrodes beingmounted on said second substrate; and wherein a voltage is appliedbetween said common electrode and each of said scanning electrodes tocause discharging to occur in said space existing between said firstsubstrate and said second substrate and wherein light is emitted byexciting a fluorescent material being arranged between said firstsubstrate and said second substrates and wherein said common electrodesand said plurality of scanning electrodes are made up of a plurality ofbelt-shaped electrodes being extended in a same direction; and aselecting circuit used to sequentially select one scanning electrode outof said plurality of scanning electrodes wherein scanning on saidbacklight and scanning on said liquid crystal display section areperformed in a same period.
 138. A liquid crystal display devicecomprising: a liquid crystal display section; and a backlightcomprising: a first substrate and a second substrate being mounted apartfrom each other wherein gas is fed into space existing between saidfirst substrate and said second substrate and a portion surrounding saidspace is sealed in a hermetic manner; a common electrode being mountedon said first substrate; a plurality of scanning electrodes beingmounted on said second substrate; wherein a voltage is applied betweensaid common electrode and each of said scanning electrode to causedischarging to occur in said space existing between said first substrateand said second substrate and wherein light is emitted by exciting afluorescent material being arranged between said first substrate andsaid second substrate; and a protrusion being protruded toward a side ofa discharging space existing between electrodes facing each other on atleast one of said common electrode and said plurality of said scanningelectrode. wherein scanning on said backlight and scanning on saidliquid crystal display section are performed in a same period.
 139. Amethod for manufacturing a backlight comprising: a step of forming ascanning electrode, a common electrode, and a fluorescent layer oneither of two substrates; a step of forming a seal layer having aplurality of partitions on either of said two substrates; and a step ofcollectively forming a plurality of backlight units by bonding said twosubstrates together and cutting the bonded two substrates for everysealing partition and by filling gas in a hermetic manner into eachsealing partition.
 140. A method for manufacturing a backlightcomprising: a step of forming a scanning electrode, a common electrode,and a fluorescent layer on either of two substrates; a step of forming aseal layer having a plurality of partitions on either of said twosubstrates; and a step of collectively forming a plurality of backlightunits by bonding said two substrates together and filling gas in ahermetic manner and then cutting the bonded two substrates filled withgas for every sealing partition.